31312331120321 has 4 divisors (see below), whose sum is σ = 31341137313792. Its totient is φ = 31283524926852.

The previous prime is 31312331120311. The next prime is 31312331120327. The reversal of 31312331120321 is 12302113321313.

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 not a de Polignac number, because 31312331120321 - 2¹⁸ = 31312330858177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31312331120327) 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, 14403095105 + ... + 14403097278.

It is an arithmetic number, because the mean of its divisors is an integer number (7835284328448).

Almost surely, 2^{31312331120321} is an apocalyptic number.

It is an amenable number.

31312331120321 is a deficient number, since it is larger than the sum of its proper divisors (28806193471).

31312331120321 is a wasteful number, since it uses less digits than its factorization.

31312331120321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28806193470.

The product of its (nonzero) digits is 1944, while the sum is 26.

Adding to 31312331120321 its reverse (12302113321313), we get a palindrome (43614444441634).

The spelling of 31312331120321 in words is "thirty-one trillion, three hundred twelve billion, three hundred thirty-one million, one hundred twenty thousand, three hundred twenty-one".