313231023122321 has 4 divisors (see below), whose sum is σ = 331656377423652. Its totient is φ = 294805668820992.

The previous prime is 313231023122243. The next prime is 313231023122333. The reversal of 313231023122321 is 123221320132313.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 187991109670225 + 125239913452096 = 13710985^2 + 11191064^2 .

It is a cyclic number.

It is not a de Polignac number, because 313231023122321 - 2³⁸ = 312956145215377 is a prime.

It is a super-2 number, since 2×313231023122321² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (313231023121321) 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, 9212677150640 + ... + 9212677150673.

It is an arithmetic number, because the mean of its divisors is an integer number (82914094355913).

Almost surely, 2^{313231023122321} is an apocalyptic number.

It is an amenable number.

313231023122321 is a deficient number, since it is larger than the sum of its proper divisors (18425354301331).

313231023122321 is a wasteful number, since it uses less digits than its factorization.

313231023122321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18425354301330.

The product of its (nonzero) digits is 7776, while the sum is 29.

Adding to 313231023122321 its reverse (123221320132313), we get a palindrome (436452343254634).

The spelling of 313231023122321 in words is "three hundred thirteen trillion, two hundred thirty-one billion, twenty-three million, one hundred twenty-two thousand, three hundred twenty-one".