222222212 has 6 divisors (see below), whose sum is σ = 388888878. Its totient is φ = 111111104.

The previous prime is 222222193. The next prime is 222222227. The reversal of 222222212 is 212222222.

It can be written as a sum of positive squares in only one way, i.e., 143616256 + 78605956 = 11984^2 + 8866^2 .

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27777773 + ... + 27777780.

It is an arithmetic number, because the mean of its divisors is an integer number (64814813).

Almost surely, 2^222222212 is an apocalyptic number.

It is an amenable number.

222222212 is a deficient number, since it is larger than the sum of its proper divisors (166666666).

222222212 is a wasteful number, since it uses less digits than its factorization.

222222212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55555557 (or 55555555 counting only the distinct ones).

The product of its digits is 256, while the sum is 17.

The square root of 222222212 is about 14907.1195071348. The cubic root of 222222212 is about 605.7068549899.

Adding to 222222212 its reverse (212222222), we get a palindrome (434444434).

The spelling of 222222212 in words is "two hundred twenty-two million, two hundred twenty-two thousand, two hundred twelve".