22 (twenty-two) is the natural number following 21 and preceding 23.
is a commonly used approximation of the irrational number π, 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.