31213332012 has 24 divisors (see below), whose sum is σ = 76664324800. Its totient is φ = 9856841616.

The previous prime is 31213332011. The next prime is 31213332013. The reversal of 31213332012 is 21023331213.

It is an interprime number because it is at equal distance from previous prime (31213332011) and next prime (31213332013).

It is a self number, because there is not a number n which added to its sum of digits gives 31213332012.

It is not an unprimeable number, because it can be changed into a prime (31213332011) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 68450062 + ... + 68450517.

Almost surely, 2^31213332012 is an apocalyptic number.

It is an amenable number.

31213332012 is an abundant number, since it is smaller than the sum of its proper divisors (45450992788).

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

31213332012 is a wasteful number, since it uses less digits than its factorization.

31213332012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136900605 (or 136900603 counting only the distinct ones).

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

Adding to 31213332012 its reverse (21023331213), we get a palindrome (52236663225).

The spelling of 31213332012 in words is "thirty-one billion, two hundred thirteen million, three hundred thirty-two thousand, twelve".