21317503732 has 12 divisors (see below), whose sum is σ = 42635007520. Its totient is φ = 9136073016.

The previous prime is 21317503721. The next prime is 21317503759. The reversal of 21317503732 is 23730571312.

21317503732 is an admirable number.

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, 380669682 + ... + 380669737.

Almost surely, 2^21317503732 is an apocalyptic number.

It is an amenable number.

21317503732 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21317503732 is a wasteful number, since it uses less digits than its factorization.

21317503732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 761339430 (or 761339428 counting only the distinct ones).

The product of its (nonzero) digits is 26460, while the sum is 34.

The spelling of 21317503732 in words is "twenty-one billion, three hundred seventeen million, five hundred three thousand, seven hundred thirty-two".