321131213231 has 4 divisors (see below), whose sum is σ = 324739429200. Its totient is φ = 317522997264.

The previous prime is 321131213209. The next prime is 321131213237. The reversal of 321131213231 is 132312131123.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132312131123 = 137 ⋅965781979.

It is a cyclic number.

It is not a de Polignac number, because 321131213231 - 2²⁶ = 321064104367 is a prime.

It is a super-2 number, since 2×321131213231² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 321131213197 and 321131213206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321131213237) 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, 1804107851 + ... + 1804108028.

It is an arithmetic number, because the mean of its divisors is an integer number (81184857300).

Almost surely, 2^321131213231 is an apocalyptic number.

321131213231 is a deficient number, since it is larger than the sum of its proper divisors (3608215969).

321131213231 is an equidigital number, since it uses as much as digits as its factorization.

321131213231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3608215968.

The product of its digits is 648, while the sum is 23.

Adding to 321131213231 its reverse (132312131123), we get a palindrome (453443344354).

The spelling of 321131213231 in words is "three hundred twenty-one billion, one hundred thirty-one million, two hundred thirteen thousand, two hundred thirty-one".