231313231121 has 4 divisors (see below), whose sum is σ = 264357978432. Its totient is φ = 198268483812.

The previous prime is 231313231109. The next prime is 231313231147. The reversal of 231313231121 is 121132313132.

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 not a de Polignac number, because 231313231121 - 2¹⁰ = 231313230097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231313231181) 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, 16522373645 + ... + 16522373658.

It is an arithmetic number, because the mean of its divisors is an integer number (66089494608).

Almost surely, 2^231313231121 is an apocalyptic number.

It is an amenable number.

231313231121 is a deficient number, since it is larger than the sum of its proper divisors (33044747311).

231313231121 is an equidigital number, since it uses as much as digits as its factorization.

231313231121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33044747310.

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

Adding to 231313231121 its reverse (121132313132), we get a palindrome (352445544253).

The spelling of 231313231121 in words is "two hundred thirty-one billion, three hundred thirteen million, two hundred thirty-one thousand, one hundred twenty-one".