312131303321 has 4 divisors (see below), whose sum is σ = 312148012644. Its totient is φ = 312114594000.

The previous prime is 312131303311. The next prime is 312131303329. The reversal of 312131303321 is 123303131213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 123303131213 = 8623 ⋅14299331.

It can be written as a sum of positive squares in 2 ways, for example, as 99610303321 + 212521000000 = 315611^2 + 461000^2 .

It is a cyclic number.

It is not a de Polignac number, because 312131303321 - 2²² = 312127109017 is a prime.

It is a super-2 number, since 2×312131303321² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312131303329) 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, 8326610 + ... + 8364011.

It is an arithmetic number, because the mean of its divisors is an integer number (78037003161).

Almost surely, 2^312131303321 is an apocalyptic number.

It is an amenable number.

312131303321 is a deficient number, since it is larger than the sum of its proper divisors (16709323).

312131303321 is a wasteful number, since it uses less digits than its factorization.

312131303321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16709322.

The product of its (nonzero) digits is 972, while the sum is 23.

Adding to 312131303321 its reverse (123303131213), we get a palindrome (435434434534).

The spelling of 312131303321 in words is "three hundred twelve billion, one hundred thirty-one million, three hundred three thousand, three hundred twenty-one".