22222221212 has 6 divisors (see below), whose sum is σ = 38888887128. Its totient is φ = 11111110604.

The previous prime is 22222221193. The next prime is 22222221227. The reversal of 22222221212 is 21212222222.

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 as a sum of consecutive naturals, namely, 2777777648 + ... + 2777777655.

It is an arithmetic number, because the mean of its divisors is an integer number (6481481188).

Almost surely, 2^22222221212 is an apocalyptic number.

It is an amenable number.

22222221212 is a deficient number, since it is larger than the sum of its proper divisors (16666665916).

22222221212 is a wasteful number, since it uses less digits than its factorization.

22222221212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5555555307 (or 5555555305 counting only the distinct ones).

The product of its digits is 512, while the sum is 20.

Adding to 22222221212 its reverse (21212222222), we get a palindrome (43434443434).

The spelling of 22222221212 in words is "twenty-two billion, two hundred twenty-two million, two hundred twenty-one thousand, two hundred twelve".