22 (number)
Template:Infobox number 22 (twenty-two) is the natural number following 21 and preceding 23.
In mathematics
22 is a semiprime,[1] a Smith number, and an Erdős–Woods number.[2][3] is a commonly used approximation of the irrational number [[Pi|Template:Pi]], the ratio of the circumference of a circle to its diameter.
22 can read as "two twos", which is the only fixed point of John Conway's look-and-say function.[4]
The number 22 appears prominently within sporadic groups. The Mathieu group M22 is one of 26 sporadic finite simple groups, defined as the 3-transitive permutation representation on 22 points.[5] There are also 22 regular complex apeirohedra.[6]
In other fields
- Catch-22 (1961), Joseph Heller's novel, and its 1970 film adaptation gave rise to the expression of logic "catch-22".[7]
In culture and religion
- 22 is a master number in numerology.[8]
- There are 22 colored properties on a traditional Monopoly board.
In weights and measures
In other uses
Twenty-two may also refer to:
- In French jargon, "22" is used as a phrase to warn of the coming of the police (typically "Template:Lang !" (In English: "5-0! Cops!")
- In Spanish lottery and bingo, 22 is nicknamed Template:Langx after its shape.[10][11]