231121310023 has 4 divisors (see below), whose sum is σ = 231158254320. Its totient is φ = 231084365728.

The previous prime is 231121310011. The next prime is 231121310033. The reversal of 231121310023 is 320013121132.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231121310023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231121310003) 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, 18462763 + ... + 18475276.

It is an arithmetic number, because the mean of its divisors is an integer number (57789563580).

Almost surely, 2^231121310023 is an apocalyptic number.

231121310023 is a deficient number, since it is larger than the sum of its proper divisors (36944297).

231121310023 is an equidigital number, since it uses as much as digits as its factorization.

231121310023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36944296.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 231121310023 its reverse (320013121132), we get a palindrome (551134431155).

The spelling of 231121310023 in words is "two hundred thirty-one billion, one hundred twenty-one million, three hundred ten thousand, twenty-three".