21596724160 has 56 divisors (see below), whose sum is σ = 56102408496. Its totient is φ = 7853352960.

The previous prime is 21596724109. The next prime is 21596724169. The reversal of 21596724160 is 6142769512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21596724169) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3064197 + ... + 3071236.

Almost surely, 2^21596724160 is an apocalyptic number.

21596724160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21596724160 is an abundant number, since it is smaller than the sum of its proper divisors (34505684336).

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

21596724160 is a wasteful number, since it uses less digits than its factorization.

21596724160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6135461 (or 6135451 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 43.

The spelling of 21596724160 in words is "twenty-one billion, five hundred ninety-six million, seven hundred twenty-four thousand, one hundred sixty".