21631132506 has 32 divisors (see below), whose sum is σ = 45498728448. Its totient is φ = 6842571120.

The previous prime is 21631132433. The next prime is 21631132543. The reversal of 21631132506 is 60523113612.

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, 599590 + ... + 634641.

It is an arithmetic number, because the mean of its divisors is an integer number (1421835264).

Almost surely, 2^21631132506 is an apocalyptic number.

21631132506 is an abundant number, since it is smaller than the sum of its proper divisors (23867595942).

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

21631132506 is a wasteful number, since it uses less digits than its factorization.

21631132506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1234386.

The product of its (nonzero) digits is 6480, while the sum is 30.

The spelling of 21631132506 in words is "twenty-one billion, six hundred thirty-one million, one hundred thirty-two thousand, five hundred six".