21057604432 has 40 divisors (see below), whose sum is σ = 41282125632. Its totient is φ = 10404825600.

The previous prime is 21057604427. The next prime is 21057604441. The reversal of 21057604432 is 23440675012.

It is a congruent number.

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, 484293 + ... + 525979.

Almost surely, 2^21057604432 is an apocalyptic number.

It is an amenable number.

21057604432 is a deficient number, since it is larger than the sum of its proper divisors (20224521200).

21057604432 is a wasteful number, since it uses less digits than its factorization.

21057604432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42067 (or 42061 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 34.

The spelling of 21057604432 in words is "twenty-one billion, fifty-seven million, six hundred four thousand, four hundred thirty-two".