21307952464 has 20 divisors (see below), whose sum is σ = 41466033504. Its totient is φ = 10607040608.

The previous prime is 21307952429. The next prime is 21307952489. The reversal of 21307952464 is 46425970312.

It is a self number, because there is not a number n which added to its sum of digits gives 21307952464.

It is a congruent number.

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, 2929732 + ... + 2936995.

Almost surely, 2^21307952464 is an apocalyptic number.

It is an amenable number.

21307952464 is a deficient number, since it is larger than the sum of its proper divisors (20158081040).

21307952464 is a wasteful number, since it uses less digits than its factorization.

21307952464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5866962 (or 5866956 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 43.

The spelling of 21307952464 in words is "twenty-one billion, three hundred seven million, nine hundred fifty-two thousand, four hundred sixty-four".