31321112002131 has 16 divisors (see below), whose sum is σ = 47746913301504. Its totient is φ = 17890464085824.

The previous prime is 31321112002057. The next prime is 31321112002153. The reversal of 31321112002131 is 13120021112313.

It is not a de Polignac number, because 31321112002131 - 2³⁸ = 31046234095187 is a prime.

It is a super-2 number, since 2×31321112002131² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 31321112002098 and 31321112002107.

It is not an unprimeable number, because it can be changed into a prime (31321112002171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 304705770 + ... + 304808543.

It is an arithmetic number, because the mean of its divisors is an integer number (2984182081344).

Almost surely, 2^{31321112002131} is an apocalyptic number.

31321112002131 is a deficient number, since it is larger than the sum of its proper divisors (16425801299373).

31321112002131 is a wasteful number, since it uses less digits than its factorization.

31321112002131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609516770.

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 31321112002131 its reverse (13120021112313), we get a palindrome (44441133114444).

The spelling of 31321112002131 in words is "thirty-one trillion, three hundred twenty-one billion, one hundred twelve million, two thousand, one hundred thirty-one".