312113021321 has 4 divisors (see below), whose sum is σ = 312114150912. Its totient is φ = 312111891732.

The previous prime is 312113021309. The next prime is 312113021357. The reversal of 312113021321 is 123120311213.

It is a happy number.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 123120311213 = 307 ⋅401043359.

It is a cyclic number.

It is not a de Polignac number, because 312113021321 - 2³⁸ = 37235114377 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 312113021293 and 312113021302.

It is not an unprimeable number, because it can be changed into a prime (312113021371) 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, 157976 + ... + 805718.

It is an arithmetic number, because the mean of its divisors is an integer number (78028537728).

Almost surely, 2^312113021321 is an apocalyptic number.

It is an amenable number.

312113021321 is a deficient number, since it is larger than the sum of its proper divisors (1129591).

312113021321 is an equidigital number, since it uses as much as digits as its factorization.

312113021321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1129590.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 312113021321 its reverse (123120311213), we get a palindrome (435233332534).

The spelling of 312113021321 in words is "three hundred twelve billion, one hundred thirteen million, twenty-one thousand, three hundred twenty-one".