31312133321 has 24 divisors (see below), whose sum is σ = 37882557504. Its totient is φ = 25784952480.

The previous prime is 31312133311. The next prime is 31312133353. The reversal of 31312133321 is 12333121313.

It is not a de Polignac number, because 31312133321 - 2³⁰ = 30238391497 is a prime.

It is a super-2 number, since 2×31312133321² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31312133311) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6716 + ... + 250338.

It is an arithmetic number, because the mean of its divisors is an integer number (1578439896).

Almost surely, 2^31312133321 is an apocalyptic number.

It is an amenable number.

31312133321 is a deficient number, since it is larger than the sum of its proper divisors (6570424183).

31312133321 is a wasteful number, since it uses less digits than its factorization.

31312133321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243741 (or 243734 counting only the distinct ones).

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

Adding to 31312133321 its reverse (12333121313), we get a palindrome (43645254634).

The spelling of 31312133321 in words is "thirty-one billion, three hundred twelve million, one hundred thirty-three thousand, three hundred twenty-one".