21557860932 has 12 divisors (see below), whose sum is σ = 50301675536. Its totient is φ = 7185953640.

The previous prime is 21557860903. The next prime is 21557861021. The reversal of 21557860932 is 23906875512.

It is a tau number, because it is divible by the number of its divisors (12).

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, 898244194 + ... + 898244217.

Almost surely, 2^21557860932 is an apocalyptic number.

It is an amenable number.

21557860932 is an abundant number, since it is smaller than the sum of its proper divisors (28743814604).

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

21557860932 is a wasteful number, since it uses less digits than its factorization.

21557860932 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1796488418 (or 1796488416 counting only the distinct ones).

The product of its (nonzero) digits is 907200, while the sum is 48.

The spelling of 21557860932 in words is "twenty-one billion, five hundred fifty-seven million, eight hundred sixty thousand, nine hundred thirty-two".