21212200122 has 32 divisors (see below), whose sum is σ = 44184714624. Its totient is φ = 6782731200.

The previous prime is 21212200043. The next prime is 21212200147. The reversal of 21212200122 is 22100221212.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 657129 + ... + 688652.

It is an arithmetic number, because the mean of its divisors is an integer number (1380772332).

Almost surely, 2^21212200122 is an apocalyptic number.

21212200122 is an abundant number, since it is smaller than the sum of its proper divisors (22972514502).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21212200122 is a wasteful number, since it uses less digits than its factorization.

21212200122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1345894.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21212200122 its reverse (22100221212), we get a palindrome (43312421334).

The spelling of 21212200122 in words is "twenty-one billion, two hundred twelve million, two hundred thousand, one hundred twenty-two".