231313111021 has 4 divisors (see below), whose sum is σ = 231322085500. Its totient is φ = 231304136544.

The previous prime is 231313110961. The next prime is 231313111027. The reversal of 231313111021 is 120111313132.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 38706234121 + 192606876900 = 196739^2 + 438870^2 .

It is a cyclic number.

It is not a de Polignac number, because 231313111021 - 2¹³ = 231313102829 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 231313111021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231313111027) 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, 4448466 + ... + 4500163.

It is an arithmetic number, because the mean of its divisors is an integer number (57830521375).

Almost surely, 2^231313111021 is an apocalyptic number.

It is an amenable number.

231313111021 is a deficient number, since it is larger than the sum of its proper divisors (8974479).

231313111021 is an equidigital number, since it uses as much as digits as its factorization.

231313111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8974478.

The product of its (nonzero) digits is 108, while the sum is 19.

Adding to 231313111021 its reverse (120111313132), we get a palindrome (351424424153).

The spelling of 231313111021 in words is "two hundred thirty-one billion, three hundred thirteen million, one hundred eleven thousand, twenty-one".