21668038131852 has 72 divisors (see below), whose sum is σ = 62600844773376. Its totient is φ = 6190443735264.

The previous prime is 21668038131847. The next prime is 21668038131863. The reversal of 21668038131852 is 25813183086612.

21668038131852 is a `hidden beast` number, since 2 + 1 + 6 + 6 + 80 + 381 + 3 + 185 + 2 = 666.

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, 746773 + ... + 6625235.

It is an arithmetic number, because the mean of its divisors is an integer number (869456177408).

Almost surely, 2^{21668038131852} is an apocalyptic number.

It is an amenable number.

21668038131852 is an abundant number, since it is smaller than the sum of its proper divisors (40932806641524).

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

21668038131852 is a wasteful number, since it uses less digits than its factorization.

21668038131852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5893107 (or 5893102 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 54.

The spelling of 21668038131852 in words is "twenty-one trillion, six hundred sixty-eight billion, thirty-eight million, one hundred thirty-one thousand, eight hundred fifty-two".