31212312123321 has 64 divisors (see below), whose sum is σ = 54277098946560. Its totient is φ = 17352738786240.

The previous prime is 31212312123193. The next prime is 31212312123323. The reversal of 31212312123321 is 12332121321213.

31212312123321 is a `hidden beast` number, since 3 + 1 + 2 + 1 + 2 + 312 + 1 + 23 + 321 = 666.

It is not a de Polignac number, because 31212312123321 - 2⁷ = 31212312123193 is a prime.

It is a super-2 number, since 2×31212312123321² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (31212312123323) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 165548976 + ... + 165737406.

It is an arithmetic number, because the mean of its divisors is an integer number (848079671040).

Almost surely, 2^{31212312123321} is an apocalyptic number.

It is an amenable number.

31212312123321 is a deficient number, since it is larger than the sum of its proper divisors (23064786823239).

31212312123321 is a wasteful number, since it uses less digits than its factorization.

31212312123321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212171 (or 212165 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

Adding to 31212312123321 its reverse (12332121321213), we get a palindrome (43544433444534).

The spelling of 31212312123321 in words is "thirty-one trillion, two hundred twelve billion, three hundred twelve million, one hundred twenty-three thousand, three hundred twenty-one".