21631418124 has 24 divisors (see below), whose sum is σ = 51704366448. Its totient is φ = 7034607360.

The previous prime is 21631418119. The next prime is 21631418153. The reversal of 21631418124 is 42181413612.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21982657 + ... + 21983640.

It is an arithmetic number, because the mean of its divisors is an integer number (2154348602).

Almost surely, 2^21631418124 is an apocalyptic number.

It is an amenable number.

21631418124 is an abundant number, since it is smaller than the sum of its proper divisors (30072948324).

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

21631418124 is a wasteful number, since it uses less digits than its factorization.

21631418124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43966345 (or 43966343 counting only the distinct ones).

The product of its digits is 9216, while the sum is 33.

The spelling of 21631418124 in words is "twenty-one billion, six hundred thirty-one million, four hundred eighteen thousand, one hundred twenty-four".