222221212 has 24 divisors (see below), whose sum is σ = 416734416. Its totient is φ = 103312128.

The previous prime is 222221201. The next prime is 222221221. The reversal of 222221212 is 212122222.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14043 + ... + 25330.

It is an arithmetic number, because the mean of its divisors is an integer number (17363934).

Almost surely, 2^222221212 is an apocalyptic number.

It is an amenable number.

222221212 is a deficient number, since it is larger than the sum of its proper divisors (194513204).

222221212 is a wasteful number, since it uses less digits than its factorization.

222221212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39477 (or 39475 counting only the distinct ones).

The product of its digits is 128, while the sum is 16.

The square root of 222221212 is about 14907.0859660767. The cubic root of 222221212 is about 605.7059464282.

Adding to 222221212 its reverse (212122222), we get a palindrome (434343434).

The spelling of 222221212 in words is "two hundred twenty-two million, two hundred twenty-one thousand, two hundred twelve".