31312211213213 has 24 divisors (see below), whose sum is σ = 38528737633728. Its totient is φ = 25320450488256.

The previous prime is 31312211213207. The next prime is 31312211213219. The reversal of 31312211213213 is 31231211221313.

It is an interprime number because it is at equal distance from previous prime (31312211213207) and next prime (31312211213219).

It is not a de Polignac number, because 31312211213213 - 2⁴ = 31312211213197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31312211213219) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 190216931 + ... + 190381472.

It is an arithmetic number, because the mean of its divisors is an integer number (1605364068072).

Almost surely, 2^{31312211213213} is an apocalyptic number.

It is an amenable number.

31312211213213 is a deficient number, since it is larger than the sum of its proper divisors (7216526420515).

31312211213213 is a wasteful number, since it uses less digits than its factorization.

31312211213213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380598513 (or 380598506 counting only the distinct ones).

The product of its digits is 1296, while the sum is 26.

Adding to 31312211213213 its reverse (31231211221313), we get a palindrome (62543422434526).

It can be divided in two parts, 3131221 and 1213213, that added together give a palindrome (4344434).

The spelling of 31312211213213 in words is "thirty-one trillion, three hundred twelve billion, two hundred eleven million, two hundred thirteen thousand, two hundred thirteen".