231312312121 has 6 divisors (see below), whose sum is σ = 254252376266. Its totient is φ = 210283920000.

The previous prime is 231312312113. The next prime is 231312312139. The reversal of 231312312121 is 121213213132.

It can be written as a sum of positive squares in only one way, i.e., 117605100096 + 113707212025 = 342936^2 + 337205^2 .

It is not a de Polignac number, because 231312312121 - 2³ = 231312312113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231312312092 and 231312312101.

It is not an unprimeable number, because it can be changed into a prime (231312316121) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 955835880 + ... + 955836121.

Almost surely, 2^231312312121 is an apocalyptic number.

It is an amenable number.

231312312121 is a deficient number, since it is larger than the sum of its proper divisors (22940064145).

231312312121 is a wasteful number, since it uses less digits than its factorization.

231312312121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1911672023 (or 1911672012 counting only the distinct ones).

The product of its digits is 432, while the sum is 22.

Adding to 231312312121 its reverse (121213213132), we get a palindrome (352525525253).

The spelling of 231312312121 in words is "two hundred thirty-one billion, three hundred twelve million, three hundred twelve thousand, one hundred twenty-one".