21650710500 has 72 divisors (see below), whose sum is σ = 68300788920. Its totient is φ = 5773521600.

The previous prime is 21650710483. The next prime is 21650710513. The reversal of 21650710500 is 501705612.

21650710500 is a `hidden beast` number, since 2 + 1 + 650 + 7 + 1 + 0 + 5 + 0 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 4880978496 + 16769732004 = 69864^2 + 129498^2 .

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, 2401135 + ... + 2410134.

Almost surely, 2^21650710500 is an apocalyptic number.

21650710500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21650710500 is an abundant number, since it is smaller than the sum of its proper divisors (46650078420).

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

21650710500 is a wasteful number, since it uses less digits than its factorization.

21650710500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4811294 (or 4811279 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 27.

The spelling of 21650710500 in words is "twenty-one billion, six hundred fifty million, seven hundred ten thousand, five hundred".