21122860956 has 24 divisors (see below), whose sum is σ = 51880711680. Its totient is φ = 6670377072.

The previous prime is 21122860951. The next prime is 21122860963. The reversal of 21122860956 is 65906822112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122860951) by changing a digit.

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, 46321836 + ... + 46322291.

It is an arithmetic number, because the mean of its divisors is an integer number (2161696320).

Almost surely, 2^21122860956 is an apocalyptic number.

It is an amenable number.

21122860956 is an abundant number, since it is smaller than the sum of its proper divisors (30757850724).

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

21122860956 is a wasteful number, since it uses less digits than its factorization.

21122860956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92644153 (or 92644151 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 42.

The spelling of 21122860956 in words is "twenty-one billion, one hundred twenty-two million, eight hundred sixty thousand, nine hundred fifty-six".