21713595904 has 240 divisors, whose sum is σ = 58588928640. Its totient is φ = 7806689280.

The previous prime is 21713595877. The next prime is 21713595931. The reversal of 21713595904 is 40959531712.

It is an interprime number because it is at equal distance from previous prime (21713595877) and next prime (21713595931).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6661027 + ... + 6664285.

It is an arithmetic number, because the mean of its divisors is an integer number (244120536).

Almost surely, 2^21713595904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21713595904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29294464320).

21713595904 is an abundant number, since it is smaller than the sum of its proper divisors (36875332736).

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

21713595904 is a wasteful number, since it uses less digits than its factorization.

21713595904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3321 (or 3292 counting only the distinct ones).

The product of its (nonzero) digits is 340200, while the sum is 46.

The spelling of 21713595904 in words is "twenty-one billion, seven hundred thirteen million, five hundred ninety-five thousand, nine hundred four".