222 (number)

222 (two hundred [and] twenty-two) is the natural number following 221 and preceding 223.

It is a decimal repdigit and a strobogrammatic number (meaning that it looks the same turned upside down on a calculator display). It is one of the numbers whose digit sum in decimal is the same as it is in binary.

222 is a noncototient, meaning that it cannot be written in the form n − φ(n) where φ is Euler's totient function counting the number of values that are smaller than n and relatively prime to it.

There are exactly 222 distinct ways of assigning a meet and join operation to a set of ten unlabeled elements in order to give them the structure of a lattice, and exactly 222 different six-edge polysticks.

See also

Number

A number is a mathematical object used to count, measure, and label. The original examples are the natural numbers 1, 2, 3, and so forth. A notational symbol that represents a number is called a numeral. In addition to their use in counting and measuring, numerals are often used for labels (as with telephone numbers), for ordering (as with serial numbers), and for codes (as with ISBNs). In common usage, the term number may refer to a symbol, a word, or a mathematical abstraction.

In mathematics, the notion of number has been extended over the centuries to include 0, negative numbers, rational numbers such as and , real numbers such as and , complex numbers, which extend the real numbers by including , and sometimes additional objects. Calculations with numbers are done with arithmetical operations, the most familiar being addition, subtraction, multiplication, division, and exponentiation. Their study or usage is called arithmetic. The same term may also refer to number theory, the study of the properties of the natural numbers.

Angel

An angel is a purely spiritual being found in various religions and mythologies. In Abrahamic religions and Zoroastrianism, angels are often depicted as benevolent celestial beings who act as intermediaries between God or Heaven and Earth, or as guardian spirits or a guiding influence. Other roles of angels include protecting and guiding human beings, and carrying out God's tasks. The term "angel" has also been diversed to various notions of spirits or figures found in many other religious traditions. The theological study of angels is known as "angelology".

In art, angels are often depicted with bird-like wings on their back, a halo, robes and various forms of glowing light.

Etymology

The word angel (pronounced /ˈeɪn.dʒəl/) in English is a blend of Old English engel (with a hard g) and Old French angele. Both derive from Late Latin angelus "messenger", which in turn was borrowed from Late Greek ἄνγελος ángelos. According to R. S. P. Beekes, ángelos itself may be "an Oriental loan, like ἄγγαρος ['Persian mounted courier']." The word's earliest form is Mycenaean a-ke-ro attested in Linear B syllabic script.

222

Year 222 (CCXXII) was a common year starting on Tuesday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Antoninus and Severus (or, less frequently, year 975 Ab urbe condita). The denomination 222 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.

Events

By place

Roman Empire

Asia