21516107752764 has 24 divisors (see below), whose sum is σ = 55782501581520. Its totient is φ = 7172035917552.

The previous prime is 21516107752717. The next prime is 21516107752793. The reversal of 21516107752764 is 46725770161512.

21516107752764 is a `hidden beast` number, since 2 + 1 + 5 + 1 + 6 + 107 + 7 + 527 + 6 + 4 = 666.

It is a super-2 number, since 2×21516107752764² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 21516107752764.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99611609859 + ... + 99611610074.

It is an arithmetic number, because the mean of its divisors is an integer number (2324270899230).

Almost surely, 2^{21516107752764} is an apocalyptic number.

It is an amenable number.

21516107752764 is an abundant number, since it is smaller than the sum of its proper divisors (34266393828756).

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

21516107752764 is a wasteful number, since it uses less digits than its factorization.

21516107752764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199223219946 (or 199223219938 counting only the distinct ones).

The product of its (nonzero) digits is 4939200, while the sum is 54.

The spelling of 21516107752764 in words is "twenty-one trillion, five hundred sixteen billion, one hundred seven million, seven hundred fifty-two thousand, seven hundred sixty-four".