131310231021 has 12 divisors (see below), whose sum is σ = 189675917340. Its totient is φ = 87537576960.

The previous prime is 131310231011. The next prime is 131310231053. The reversal of 131310231021 is 120132013131.

It can be written as a sum of positive squares in 2 ways, for example, as 118741578921 + 12568652100 = 344589^2 + 112110^2 .

It is not a de Polignac number, because 131310231021 - 2¹⁸ = 131309968877 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 131310230985 and 131310231003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131310231011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 138541 + ... + 530861.

It is an arithmetic number, because the mean of its divisors is an integer number (15806326445).

Almost surely, 2^131310231021 is an apocalyptic number.

It is an amenable number.

131310231021 is a deficient number, since it is larger than the sum of its proper divisors (58365686319).

131310231021 is a wasteful number, since it uses less digits than its factorization.

131310231021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429516 (or 429513 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 131310231021 its reverse (120132013131), we get a palindrome (251442244152).

The spelling of 131310231021 in words is "one hundred thirty-one billion, three hundred ten million, two hundred thirty-one thousand, twenty-one".