21656522432 has 28 divisors (see below), whose sum is σ = 43024568256. Its totient is φ = 10815686400.

The previous prime is 21656522401. The next prime is 21656522467. The reversal of 21656522432 is 23422565612.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140819 + ... + 251282.

Almost surely, 2^21656522432 is an apocalyptic number.

It is an amenable number.

21656522432 is a deficient number, since it is larger than the sum of its proper divisors (21368045824).

21656522432 is an equidigital number, since it uses as much as digits as its factorization.

21656522432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392976 (or 392966 counting only the distinct ones).

The product of its digits is 172800, while the sum is 38.

The spelling of 21656522432 in words is "twenty-one billion, six hundred fifty-six million, five hundred twenty-two thousand, four hundred thirty-two".