22 (twenty-two) is the natural number following 21 and preceding 23.
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, 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.
Maharana Pratap or Pratap Singh (May 24, 1540 – January 19, 1597) was a Hindu ruler of Mewar, a small region in north-western India in the present day state of Rajasthan. In popular Indian culture, Pratap is considered to exemplify the qualities like bravery and chivalry to which Rajputs aspire, especially in context of his opposition to the Akbar. The struggle between Rajput confederacy led by Pratap Singh, and the Mughal Empire under Akbar, has often been characterised in popular Hindutva culture as a struggle between Hindus and the 'invading' Muslims, much on the same lines as the struggle between Shivaji and Aurangzeb a little less than a century later. However, notably, unlike Shivaji, Pratap Singh has also symbolised the pride and prestige of upper caste Hindus in northern India, because of the obvious differences between their lineages - but this allegation have little truth because much of Pratap's own soldiery were recruited from among tribal people like Bhils and backward castes like Lohars, while his own upper caste contemporaries like Man Singh of Amber supported Mughals.
Tarak Mehta (born 1930) is an Indian columnist, humorist, writer and playwright. best known for the column Duniya Na Undha Chasma in Gujarati Language. He has translated and adapted several comedies into Gujarati, and has been well-known figure in the Gujarati theatre.
The humorous weekly column first appeared in Chitralekha in March 1971 and ever since has been looking at contemporary issues from a different perspective. He has published 80 books, over the years, three books are based on the columns he wrote in Gujarati newspaper, Divya Bhaskar while rest were compiled from the stories in Taarak Mehta Ka Ooltah Chashmah.
In 2008 SAB TV, a popular entertainment channel in India, started a show Taarak Mehta Ka Ooltah Chashmah that is based on his column., and soon it became the flagship show of the channel.
He stays in Ahmedabad, Gujarat, where he moved in year 2000, with second wife, Indu of over 30 years, His first wife, Ila who later married Manohar Doshi, (died 2006), also stayed in the same apartment building. He has daughter from his first marriage, Ishani, who stays in US, and has two children, Kushan and Shaili.