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22 (twenty-two) is the natural number following 21 and preceding 23.

In mathematics[link]

Twenty-two is an even composite number, its proper divisors being 1, 2 and 11. 22 is the sixth discrete semiprime and the fourth in the (2.q) family. With 21 it forms the second discrete semiprime pair. 22 has an aliquot sum of 14 and is the fifth composite number found in the 7-aliquot tree. It has a 7- member aliquot sequence 22, 14, 10, 8, 7, 1, 0 of which the next two members are themselves discrete semiprimes, 22 is the first discrete semiprime exhibiting this property. 169 also has 14 as its aliquot sum. 22 is itself the aliquot sum of two numbers 20, 38.

Twenty-two is a pentagonal number and a centered heptagonal number. When cutting a circle with just six line segments, the maximum number of pieces that can be so created is 22,^[1] thus 22 is a central polygonal number (see lazy caterer's sequence).

The sum of the totient function for the first eight integers is 22. 22 is a Perrin number, preceded in the sequence by 10, 12, 17.

22 divided by 7 approximates the irrational number π, the ratio of the circumference of a circle to its diameter.

Since it is possible to find sequences of 22 consecutive integers such that each inner member shares a factor with either the first or the last member, 22 is an Erdős–Woods number.

It is a Smith number in base 10.

In physics and chemistry[link]

• The atomic number of titanium is 22.

In religion[link]

• There are 22 letters in the Hebrew alphabet
• There are 22 chapters of the Revelation of John in the Bible
• In the Kabbalah, there are 22 paths between the sephiroth
• Psalm 22 (22nd in the Book of Psalm in the King James Bible), described by the New American Standard Bible as the "A Cry of Anguish and a Song of Praise", is the Psalm to which the crucified and dying Jesus makes reference, citing its first verse in Aramaic (Matthew 27:46; Mark 15:34)
• There are 22 verses in Surah "Al Burooj"(The Zodiac, or Constellations), in the Quran. Linking the Zodiac and the mystery of the number 22, as found in the Major Arcana.

In numerals[link]

• In the divinatory tarot, there are 22 major arcana cards. These cards are numbered 0-21, so it is a matter of interpretation whether The Fool or The World is card number 22. The latter card is almost always associated with hard workers, a red-gold colour, and a rose-gold gemstone. The digital root of the 22 is the 4, which is the number of hard work.

In sports[link]

• In rugby union:
  • The "22" is a the line in each half of the field which is 22 metres from the respective try line. It has significance in a number of laws particularly relating to kicking the ball away.
  • In all international matches and almost all top-level league competitions, each team is allowed to name a squad of 22 players for a given match.
• In Australian rules football, each team is allowed a squad of 22 players (18 on the field and 4 interchanges).
• 22 is the number of players on the field in a football (soccer) match, and also the number of players on the field at any one time in an American football match.
• The jersey number 22 has been retired by several North American sports teams in honor of past playing greats:
  • In Major League Baseball:
    • The Baltimore Orioles, for Hall of Famer Jim Palmer.
  • In the NBA:
    • The Boston Celtics, for Hall of Famer Ed Macauley.
    • The Cleveland Cavaliers, for Larry Nance.
    • The Dallas Mavericks, for Rolando Blackman.
    • The Houston Rockets and Portland Trail Blazers, both for Hall of Famer Clyde Drexler.
    • The Los Angeles Lakers, for Hall of Famer Elgin Baylor.
    • The Lakers have separately honored #22 for Hall of Famer Slater Martin, who wore the number before Baylor when the team was the Minneapolis Lakers.
    • The New York Knicks, for Hall of Famer Dave DeBusschere.
  • In the NFL:
    • The Baltimore Colts retired #22 for Buddy Young. Since the team's controversial relocation to Indianapolis, the current Indianapolis Colts have not retired any numbers, but continue to honor all numbers retired by the franchise in Baltimore.
    • The Detroit Lions, for Hall of Famer Bobby Layne.
    • The New Orleans Saints, for Tracy Porter.
    • The Dallas Cowboys have a policy of not retiring numbers. However, the team has not issued #22 since Hall of Famer Emmitt Smith left the team in 2002.
  • In the NHL:
    • The New York Islanders, for Hall of Famer Mike Bossy.
• The length of a cricket pitch is 22 yards.
• "22" is a common name for the .22 calibre .22 Long Rifle cartridge.
• "22" is the number of cars in NASCAR's Sprint Cup Series and Nationwide Series, both Dodges currently owned by Penske Racing. A. J. Allmendinger has the Sprint Cup ride in 2012, and the Nationwide car is driven by Brad Keselowski with Jacques Villeneuve taking over for road courses.
• "22" was the number of Lewis Hamilton's McLaren-Mercedes in 2008 and is the number of Jenson Button's Brawn-Mercedes in 2009, both winning the drivers' championship that year.
• "22" was the jersey number of Mark Ingram, running back for the University of Alabama, who was the Crimson Tide's first ever Heisman Trophy winner. He did so in 2009, the same year the Tide won their 22nd SEC championship.

In music[link]

• The name of a song by punk band Millencolin.
• In Jay-Z's song "22 Two's", he rhymes the words: too, to and two, 22 times in the first verse.
• Iron Maiden has a song named "22 Acacia Avenue".
• Death Metal band Hypocrisy album "Catch 22" released in year 2002.
• Lily Allen has a song titled "22" from her album It's Not Me, It's You.
• Paul Weller has a song and album named 22 Dreams. The album contains 22 songs on it, including the song "22 Dreams".
• The Norwegian electronica project Ugress uses 22 as a recurring theme. All four albums features a track with 22 in the title.
• Australian alternative rock band Sick Puppies have a song called Catch 22 on the album Dog's Breakfast.

In journalism, literature, fashion, art, film and television[link]

• Catch-22, the 1961 novel (and its 1970 film version) by Joseph Heller, which consequently gave rise to the expression "catch-22"
• Twenty-Two, Season 2–episode 17 (February 10, 1961) of the 1959-64 TV series The Twilight Zone in which a hospitalized dancer has nightmares about a sinister nurse inviting her to Room 22, the hospital morgue.
• In the online series Prom Queen, the number 22 factors prominently into the story, appearing in numerous episodes, and the digits in the date of the prom (6/9/07) add up to 22.
• Revista 22, a magazine published in Romania
• The typical (minimum) number of episodes in a season for a television program broadcast on a major American network is 22.
• Insult comedian Jack E. Leonard, on his numerous television game show appearances, answered with "22" to any question requiring a numerical response.
• On the show Most Evil, a forensic psychiatrist scales from 1 to 22, evilness is mentally evaluated.
• There are 22 stars in the Paramount Films logo.
• The typical length of a half hour sitcom not including commercials is 22 minutes.
• In the 1942 film Casablanca, Rick's Café Americain has a trick roulette wheel. Rick (played by Humphrey Bogart) uncharacteristically takes pity on a young Bulgarian refugee couple. The husband has lost most of his money at roulette, trying to win enough to bribe police captain Renault. Rick suggests the man bet on 22. After the number comes up, Rick tells him to let it all ride. He does, and wins again. Rick tells him to cash in his winnings ... and never come back.

In weights and measures[link]

• The number of yards in a chain.
• A cricket pitch is 22 yards in length

In computing[link]

• The standard port number for the Secure Shell protocol
• A quotation mark (in a URL it appears as a "%22")

In technology[link]

• 22 is the designation of the USAF stealth fighter, the F-22 Raptor.
• .22 Long Rifle

In photography[link]

• f/22 is the largest f-stop (and thus smallest aperture) available on most lenses made for single-lens reflex cameras

In politics[link]

• The central number in the numerologically-based political platform of fringe U.S. Presidential candidate Love 22
• 22nd Bahman 1357 (according to the Iranian calendar; February 11, 1979) a revolution took place in Iran resulting in the decline of Pahlavi Dynasty in Iran which consequently led to establishment of the Islamic Republic of Iran under the leadership of Ruh-o llah Khomayni. Latter this day has been annually celebrated by the Iranian government.

In jargon[link]

• In French, "22" is used as a phrase to warn of the coming of the police (typically "22, v'là les flics !", "22, here come the cops!")

In other fields[link]

Twenty-two may also refer to:

• The number of the French department Côtes-d'Armor
• The Titanic was traveling at a speed of 22 knots before it crashed into an iceberg.
• In bingo, 22 is referred to as 'Two Little Ducks'
• The license plate number of Edirne, Turkey

See also[link]

• Catch 22 (disambiguation)
• Synchronicity
• 22 (numerology)

References[link]

1. ^ Wells, D. The Penguin Dictionary of Curious and Interesting Numbers London: Penguin Group. (1986): 31

External links[link]

Wikimedia Commons has media related to: 22 (number)

• The Number 22 at The Database of Number Correlationsvep:22 (lugu)