21621796560432 has 40 divisors (see below), whose sum is σ = 62062564202480. Its totient is φ = 7207265520000.

The previous prime is 21621796560401. The next prime is 21621796560451. The reversal of 21621796560432 is 23406569712612.

It is a happy number.

21621796560432 is a `hidden beast` number, since 2 + 1 + 6 + 2 + 1 + 79 + 6 + 560 + 4 + 3 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25025227069 + ... + 25025227932.

It is an arithmetic number, because the mean of its divisors is an integer number (1551564105062).

Almost surely, 2^{21621796560432} is an apocalyptic number.

It is an amenable number.

21621796560432 is an abundant number, since it is smaller than the sum of its proper divisors (40440767642048).

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

21621796560432 is a wasteful number, since it uses less digits than its factorization.

21621796560432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50050455018 (or 50050455006 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 54.

The spelling of 21621796560432 in words is "twenty-one trillion, six hundred twenty-one billion, seven hundred ninety-six million, five hundred sixty thousand, four hundred thirty-two".