21657602730 has 32 divisors (see below), whose sum is σ = 52636204800. Its totient is φ = 5702254272.

The previous prime is 21657602719. The next prime is 21657602749. The reversal of 21657602730 is 3720675612.

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, 4566745 + ... + 4571484.

It is an arithmetic number, because the mean of its divisors is an integer number (1644881400).

Almost surely, 2^21657602730 is an apocalyptic number.

21657602730 is an abundant number, since it is smaller than the sum of its proper divisors (30978602070).

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

21657602730 is a wasteful number, since it uses less digits than its factorization.

21657602730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9138318.

The product of its (nonzero) digits is 105840, while the sum is 39.

The spelling of 21657602730 in words is "twenty-one billion, six hundred fifty-seven million, six hundred two thousand, seven hundred thirty".