31213210021312 has 56 divisors (see below), whose sum is σ = 67578303036672. Its totient is φ = 14185975545600.

The previous prime is 31213210021307. The next prime is 31213210021337. The reversal of 31213210021312 is 21312001231213.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

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, 2532073 + ... + 8296855.

Almost surely, 2^{31213210021312} is an apocalyptic number.

31213210021312 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

31213210021312 is an abundant number, since it is smaller than the sum of its proper divisors (36365093015360).

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

31213210021312 is a wasteful number, since it uses less digits than its factorization.

31213210021312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5772497 (or 5772487 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 31213210021312 its reverse (21312001231213), we get a palindrome (52525211252525).

The spelling of 31213210021312 in words is "thirty-one trillion, two hundred thirteen billion, two hundred ten million, twenty-one thousand, three hundred twelve".