12312431321 has 2 divisors, whose sum is σ = 12312431322. Its totient is φ = 12312431320.

The previous prime is 12312431309. The next prime is 12312431347. The reversal of 12312431321 is 12313421321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12285505600 + 26925721 = 110840^2 + 5189^2 .

It is a cyclic number.

It is not a de Polignac number, because 12312431321 - 2¹⁴ = 12312414937 is a prime.

It is not a weakly prime, because it can be changed into another prime (12312430321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6156215660 + 6156215661.

It is an arithmetic number, because the mean of its divisors is an integer number (6156215661).

Almost surely, 2^12312431321 is an apocalyptic number.

It is an amenable number.

12312431321 is a deficient number, since it is larger than the sum of its proper divisors (1).

12312431321 is an equidigital number, since it uses as much as digits as its factorization.

12312431321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 23.

Adding to 12312431321 its reverse (12313421321), we get a palindrome (24625852642).

The spelling of 12312431321 in words is "twelve billion, three hundred twelve million, four hundred thirty-one thousand, three hundred twenty-one".