31213332120 has 64 divisors (see below), whose sum is σ = 99148237920. Its totient is φ = 7833933824.

The previous prime is 31213332097. The next prime is 31213332149. The reversal of 31213332120 is 2123331213.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7648287 + ... + 7652366.

Almost surely, 2^31213332120 is an apocalyptic number.

31213332120 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31213332120 is an abundant number, since it is smaller than the sum of its proper divisors (67934905800).

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

31213332120 is a wasteful number, since it uses less digits than its factorization.

31213332120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15300684 (or 15300680 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 31213332120 its reverse (2123331213), we get a palindrome (33336663333).

The spelling of 31213332120 in words is "thirty-one billion, two hundred thirteen million, three hundred thirty-two thousand, one hundred twenty".