21307662432 has 72 divisors (see below), whose sum is σ = 69249909456. Its totient is φ = 6087902976.

The previous prime is 21307662377. The next prime is 21307662473. The reversal of 21307662432 is 23426670312.

21307662432 is a `hidden beast` number, since 21 + 3 + 0 + 7 + 6 + 624 + 3 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5282623 + ... + 5286654.

It is an arithmetic number, because the mean of its divisors is an integer number (961804298).

Almost surely, 2^21307662432 is an apocalyptic number.

It is an amenable number.

21307662432 is an abundant number, since it is smaller than the sum of its proper divisors (47942247024).

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

21307662432 is a wasteful number, since it uses less digits than its factorization.

21307662432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10569300 (or 10569289 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 36.

The spelling of 21307662432 in words is "twenty-one billion, three hundred seven million, six hundred sixty-two thousand, four hundred thirty-two".