22221000021212 has 6 divisors (see below), whose sum is σ = 38886750037128. Its totient is φ = 11110500010604.

The previous prime is 22221000021197. The next prime is 22221000021221. The reversal of 22221000021212 is 21212000012222.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2777625002648 + ... + 2777625002655.

It is an arithmetic number, because the mean of its divisors is an integer number (6481125006188).

Almost surely, 2^{22221000021212} is an apocalyptic number.

It is an amenable number.

22221000021212 is a deficient number, since it is larger than the sum of its proper divisors (16665750015916).

22221000021212 is a wasteful number, since it uses less digits than its factorization.

22221000021212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5555250005307 (or 5555250005305 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 22221000021212 its reverse (21212000012222), we get a palindrome (43433000033434).

The spelling of 22221000021212 in words is "twenty-two trillion, two hundred twenty-one billion, twenty-one thousand, two hundred twelve".