312131123210421 has 24 divisors (see below), whose sum is σ = 451017775615680. Its totient is φ = 208012783305600.

The previous prime is 312131123210369. The next prime is 312131123210437. The reversal of 312131123210421 is 124012321131213.

312131123210421 is a `hidden beast` number, since 3 + 1 + 2 + 1 + 3 + 1 + 1 + 23 + 210 + 421 = 666.

It is not a de Polignac number, because 312131123210421 - 2²⁵ = 312131089655989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312131523210421) 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, 2841866976 + ... + 2841976806.

It is an arithmetic number, because the mean of its divisors is an integer number (18792407317320).

Almost surely, 2^{312131123210421} is an apocalyptic number.

It is an amenable number.

312131123210421 is a deficient number, since it is larger than the sum of its proper divisors (138886652405259).

312131123210421 is a wasteful number, since it uses less digits than its factorization.

312131123210421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220217 (or 220214 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

Adding to 312131123210421 its reverse (124012321131213), we get a palindrome (436143444341634).

The spelling of 312131123210421 in words is "three hundred twelve trillion, one hundred thirty-one billion, one hundred twenty-three million, two hundred ten thousand, four hundred twenty-one".