31312311011321 has 4 divisors (see below), whose sum is σ = 31361008229712. Its totient is φ = 31263613792932.

The previous prime is 31312311011227. The next prime is 31312311011329. The reversal of 31312311011321 is 12311011321313.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31312311011321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31312311011329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24348608231 + ... + 24348609516.

It is an arithmetic number, because the mean of its divisors is an integer number (7840252057428).

Almost surely, 2^{31312311011321} is an apocalyptic number.

It is an amenable number.

31312311011321 is a deficient number, since it is larger than the sum of its proper divisors (48697218391).

31312311011321 is an equidigital number, since it uses as much as digits as its factorization.

31312311011321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48697218390.

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

Adding to 31312311011321 its reverse (12311011321313), we get a palindrome (43623322332634).

The spelling of 31312311011321 in words is "thirty-one trillion, three hundred twelve billion, three hundred eleven million, eleven thousand, three hundred twenty-one".