31213323012 has 12 divisors (see below), whose sum is σ = 72831087056. Its totient is φ = 10404441000.

The previous prime is 31213322989. The next prime is 31213323061. The reversal of 31213323012 is 21032331213.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 31213323012.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1300555114 + ... + 1300555137.

Almost surely, 2^31213323012 is an apocalyptic number.

It is an amenable number.

31213323012 is an abundant number, since it is smaller than the sum of its proper divisors (41617764044).

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

31213323012 is a wasteful number, since it uses less digits than its factorization.

31213323012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2601110258 (or 2601110256 counting only the distinct ones).

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

Adding to 31213323012 its reverse (21032331213), we get a palindrome (52245654225).

The spelling of 31213323012 in words is "thirty-one billion, two hundred thirteen million, three hundred twenty-three thousand, twelve".