21808900517092 has 48 divisors (see below), whose sum is σ = 41220808902000. Its totient is φ = 10036431175680.

The previous prime is 21808900517087. The next prime is 21808900517123. The reversal of 21808900517092 is 29071500980812.

It can be written as a sum of positive squares in 8 ways, for example, as 6015079984356 + 15793820532736 = 2452566^2 + 3974144^2 .

It is a Harshad number since it is a multiple of its sum of digits (52).

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, 34263034 + ... + 34893742.

It is an arithmetic number, because the mean of its divisors is an integer number (858766852125).

Almost surely, 2^{21808900517092} is an apocalyptic number.

It is an amenable number.

21808900517092 is a deficient number, since it is larger than the sum of its proper divisors (19411908384908).

21808900517092 is a wasteful number, since it uses less digits than its factorization.

21808900517092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632656 (or 632654 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 52.

The spelling of 21808900517092 in words is "twenty-one trillion, eight hundred eight billion, nine hundred million, five hundred seventeen thousand, ninety-two".