222 (two-two-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 - f(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.... There are exactly 111 ways of adding 1 to 3 (other) prime numbers to make 222.
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