131031313021 has 24 divisors (see below), whose sum is σ = 154621975680. Its totient is φ = 110694175200.

The previous prime is 131031312983. The next prime is 131031313027. The reversal of 131031313021 is 120313130131.

It is not a de Polignac number, because 131031313021 - 2²⁹ = 130494442109 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131031313021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131031313027) 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, 18299440 + ... + 18306598.

It is an arithmetic number, because the mean of its divisors is an integer number (6442582320).

Almost surely, 2^131031313021 is an apocalyptic number.

It is an amenable number.

131031313021 is a deficient number, since it is larger than the sum of its proper divisors (23590662659).

131031313021 is an equidigital number, since it uses as much as digits as its factorization.

131031313021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12505 (or 12498 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 19.

Adding to 131031313021 its reverse (120313130131), we get a palindrome (251344443152).

The spelling of 131031313021 in words is "one hundred thirty-one billion, thirty-one million, three hundred thirteen thousand, twenty-one".