21805873415352 has 48 divisors (see below), whose sum is σ = 63600464130840. Its totient is φ = 6709499512128.

The previous prime is 21805873415341. The next prime is 21805873415399. The reversal of 21805873415352 is 25351437850812.

21805873415352 is a `hidden beast` number, since 2 + 1 + 8 + 0 + 587 + 3 + 4 + 1 + 5 + 3 + 52 = 666.

It is a super-2 number, since 2×21805873415352² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11648435718 + ... + 11648437589.

Almost surely, 2^{21805873415352} is an apocalyptic number.

It is an amenable number.

21805873415352 is an abundant number, since it is smaller than the sum of its proper divisors (41794590715488).

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

21805873415352 is a wasteful number, since it uses less digits than its factorization.

21805873415352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23296873332 (or 23296873325 counting only the distinct ones).

The product of its (nonzero) digits is 8064000, while the sum is 54.

The spelling of 21805873415352 in words is "twenty-one trillion, eight hundred five billion, eight hundred seventy-three million, four hundred fifteen thousand, three hundred fifty-two".