231313120121 has 4 divisors (see below), whose sum is σ = 232192637952. Its totient is φ = 230433602292.

The previous prime is 231313120043. The next prime is 231313120139. The reversal of 231313120121 is 121021313132.

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.

It is a cyclic number.

It is not a de Polignac number, because 231313120121 - 2²⁶ = 231246011257 is a prime.

It is a super-2 number, since 2×231313120121² (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 = 231313120093 and 231313120102.

It is not an unprimeable number, because it can be changed into a prime (231313120151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 439758521 + ... + 439759046.

It is an arithmetic number, because the mean of its divisors is an integer number (58048159488).

Almost surely, 2^231313120121 is an apocalyptic number.

It is an amenable number.

231313120121 is a deficient number, since it is larger than the sum of its proper divisors (879517831).

231313120121 is an equidigital number, since it uses as much as digits as its factorization.

231313120121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 879517830.

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

Adding to 231313120121 its reverse (121021313132), we get a palindrome (352334433253).

The spelling of 231313120121 in words is "two hundred thirty-one billion, three hundred thirteen million, one hundred twenty thousand, one hundred twenty-one".