222 (two hundred [and] twenty-two) is the natural number following 221 and preceding 223. It is a repdigit composite number, and its factorization makes it a sphenic number. It is also a Harshad number.
There is no solution to the equation x - psi(x) = 222, making 222 a noncototient. Nor is there, in base 10, an integer that added to the sum of its own digits yields 222, making 222 a self number.
Radii at 0 degrees and approximately 222.49 degrees divide a circle in the golden ratio.
The ratio of the areas B / A equals the golden ratio.
The first triple repdigit in the square root of 222 is 222:
square root of 222 =
14.89966442575133971933181604612395114023452166218124
73380574030119289350747022456370098357196526519656
52139396484012226637696242316850851449289924...
A prime reciprocal magic square based on 223 in base three has a magic constant of 222.
Given 10 unlabelled nodes, 222 lattices can be created.
Two hundred and twenty-two is also:
Room 222 (TV show)
Bell 222 (helicopter)