312131340231021 has 48 divisors (see below), whose sum is σ = 477566107200000. Its totient is φ = 195769689813504.

The previous prime is 312131340231019. The next prime is 312131340231043. The reversal of 312131340231021 is 120132043131213.

312131340231021 is a `hidden beast` number, since 3 + 1 + 2 + 1 + 3 + 1 + 340 + 2 + 310 + 2 + 1 = 666.

It is not a de Polignac number, because 312131340231021 - 2¹ = 312131340231019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312131340231521) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4396242480 + ... + 4396313478.

It is an arithmetic number, because the mean of its divisors is an integer number (9949293900000).

Almost surely, 2^{312131340231021} is an apocalyptic number.

It is an amenable number.

312131340231021 is a deficient number, since it is larger than the sum of its proper divisors (165434766968979).

312131340231021 is a wasteful number, since it uses less digits than its factorization.

312131340231021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81978 (or 81975 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

Adding to 312131340231021 its reverse (120132043131213), we get a palindrome (432263383362234).

The spelling of 312131340231021 in words is "three hundred twelve trillion, one hundred thirty-one billion, three hundred forty million, two hundred thirty-one thousand, twenty-one".