21132931020 has 24 divisors (see below), whose sum is σ = 59172207024. Its totient is φ = 5635448256.

The previous prime is 21132930947. The next prime is 21132931033. The reversal of 21132931020 is 2013923112.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 176107699 + ... + 176107818.

It is an arithmetic number, because the mean of its divisors is an integer number (2465508626).

Almost surely, 2^21132931020 is an apocalyptic number.

21132931020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21132931020 is an abundant number, since it is smaller than the sum of its proper divisors (38039276004).

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

21132931020 is a wasteful number, since it uses less digits than its factorization.

21132931020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352215529 (or 352215527 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 24.

The spelling of 21132931020 in words is "twenty-one billion, one hundred thirty-two million, nine hundred thirty-one thousand, twenty".