21507526132164 has 48 divisors (see below), whose sum is σ = 55999567391040. Its totient is φ = 7138406376000.

The previous prime is 21507526132151. The next prime is 21507526132181. The reversal of 21507526132164 is 46123162570512.

21507526132164 is a `hidden beast` number, since 2 + 1 + 5 + 0 + 7 + 5 + 2 + 613 + 21 + 6 + 4 = 666.

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, 427321962 + ... + 427372289.

It is an arithmetic number, because the mean of its divisors is an integer number (1166657653980).

Almost surely, 2^{21507526132164} is an apocalyptic number.

It is an amenable number.

21507526132164 is an abundant number, since it is smaller than the sum of its proper divisors (34492041258876).

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

21507526132164 is a wasteful number, since it uses less digits than its factorization.

21507526132164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 854694497 (or 854694489 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 45.

The spelling of 21507526132164 in words is "twenty-one trillion, five hundred seven billion, five hundred twenty-six million, one hundred thirty-two thousand, one hundred sixty-four".