21725880624 has 60 divisors (see below), whose sum is σ = 69488335696. Its totient is φ = 6207394176.

The previous prime is 21725880611. The next prime is 21725880637. The reversal of 21725880624 is 42608852712.

21725880624 is a `hidden beast` number, since 2 + 1 + 7 + 2 + 588 + 0 + 62 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (21725880611) and next prime (21725880637).

It is a self number, because there is not a number n which added to its sum of digits gives 21725880624.

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, 10775719 + ... + 10777734.

Almost surely, 2^21725880624 is an apocalyptic number.

21725880624 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21725880624 is an abundant number, since it is smaller than the sum of its proper divisors (47762455072).

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

21725880624 is a wasteful number, since it uses less digits than its factorization.

21725880624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21553474 (or 21553465 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 45.

The spelling of 21725880624 in words is "twenty-one billion, seven hundred twenty-five million, eight hundred eighty thousand, six hundred twenty-four".