31321310111312 has 80 divisors (see below), whose sum is σ = 66324753694080. Its totient is φ = 14242035687936.

The previous prime is 31321310111309. The next prime is 31321310111369. The reversal of 31321310111312 is 21311101312313.

It is a super-2 number, since 2×31321310111312² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3670958 + ... + 8724594.

It is an arithmetic number, because the mean of its divisors is an integer number (829059421176).

Almost surely, 2^{31321310111312} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31321310111312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33162376847040).

31321310111312 is an abundant number, since it is smaller than the sum of its proper divisors (35003443582768).

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

31321310111312 is a wasteful number, since it uses less digits than its factorization.

31321310111312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5054100 (or 5054094 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 23.

Adding to 31321310111312 its reverse (21311101312313), we get a palindrome (52632411423625).

The spelling of 31321310111312 in words is "thirty-one trillion, three hundred twenty-one billion, three hundred ten million, one hundred eleven thousand, three hundred twelve".