21137998764610 has 192 divisors, whose sum is σ = 48994227469152. Its totient is φ = 6505508265984.

The previous prime is 21137998764607. The next prime is 21137998764647. The reversal of 21137998764610 is 1646789973112.

It can be written as a sum of positive squares in 16 ways, for example, as 2582124396201 + 18555874368409 = 1606899^2 + 4307653^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 37872892 + ... + 38426968.

Almost surely, 2^{21137998764610} is an apocalyptic number.

21137998764610 is an abundant number, since it is smaller than the sum of its proper divisors (27856228704542).

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

21137998764610 is a wasteful number, since it uses less digits than its factorization.

21137998764610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554277 (or 554270 counting only the distinct ones).

The product of its (nonzero) digits is 27433728, while the sum is 64.

The spelling of 21137998764610 in words is "twenty-one trillion, one hundred thirty-seven billion, nine hundred ninety-eight million, seven hundred sixty-four thousand, six hundred ten".