21339756072 has 64 divisors (see below), whose sum is σ = 59538369600. Its totient is φ = 7081899840.

The previous prime is 21339756049. The next prime is 21339756103. The reversal of 21339756072 is 27065793312.

21339756072 is a `hidden beast` number, since 2 + 1 + 3 + 39 + 7 + 5 + 607 + 2 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 168579 + ... + 266642.

It is an arithmetic number, because the mean of its divisors is an integer number (930287025).

Almost surely, 2^21339756072 is an apocalyptic number.

It is an amenable number.

21339756072 is an abundant number, since it is smaller than the sum of its proper divisors (38198613528).

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

21339756072 is a wasteful number, since it uses less digits than its factorization.

21339756072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435463 (or 435453 counting only the distinct ones).

The product of its (nonzero) digits is 476280, while the sum is 45.

The spelling of 21339756072 in words is "twenty-one billion, three hundred thirty-nine million, seven hundred fifty-six thousand, seventy-two".