312131340231421 has 4 divisors (see below), whose sum is σ = 322200093142144. Its totient is φ = 302062587320700.

The previous prime is 312131340231413. The next prime is 312131340231521. The reversal of 312131340231421 is 124132043131213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 312131340231421 - 2³ = 312131340231413 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 10068752910691 = 312131340231421 / (3 + 1 + 2 + 1 + 3 + 1 + 3 + 4 + 0 + 2 + 3 + 1 + 4 + 2 + 1).

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 5034376455315 + ... + 5034376455376.

It is an arithmetic number, because the mean of its divisors is an integer number (80550023285536).

Almost surely, 2^{312131340231421} is an apocalyptic number.

312131340231421 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

312131340231421 is a deficient number, since it is larger than the sum of its proper divisors (10068752910723).

312131340231421 is a wasteful number, since it uses less digits than its factorization.

312131340231421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10068752910722.

The product of its (nonzero) digits is 10368, while the sum is 31.

Adding to 312131340231421 its reverse (124132043131213), we get a palindrome (436263383362634).

The spelling of 312131340231421 in words is "three hundred twelve trillion, one hundred thirty-one billion, three hundred forty million, two hundred thirty-one thousand, four hundred twenty-one".