31213404432 has 120 divisors (see below), whose sum is σ = 103530970816. Its totient is φ = 8918107776.

The previous prime is 31213404413. The next prime is 31213404449. The reversal of 31213404432 is 23440431213.

31213404432 is a `hidden beast` number, since 3 + 1 + 213 + 4 + 0 + 443 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 31213404396 and 31213404405.

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, 546223 + ... + 600654.

Almost surely, 2^31213404432 is an apocalyptic number.

It is an amenable number.

31213404432 is an abundant number, since it is smaller than the sum of its proper divisors (72317566384).

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

31213404432 is a wasteful number, since it uses less digits than its factorization.

31213404432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1146907 (or 1146889 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 31213404432 its reverse (23440431213), we get a palindrome (54653835645).

The spelling of 31213404432 in words is "thirty-one billion, two hundred thirteen million, four hundred four thousand, four hundred thirty-two".