23131121231 has 4 divisors (see below), whose sum is σ = 23877286464. Its totient is φ = 22384956000.

The previous prime is 23131121207. The next prime is 23131121257. The reversal of 23131121231 is 13212113132.

It is a happy number.

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-23131121231 is a prime.

It is a super-2 number, since 2×23131121231² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23131121731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 373082570 + ... + 373082631.

It is an arithmetic number, because the mean of its divisors is an integer number (5969321616).

Almost surely, 2^23131121231 is an apocalyptic number.

23131121231 is a deficient number, since it is larger than the sum of its proper divisors (746165233).

23131121231 is an equidigital number, since it uses as much as digits as its factorization.

23131121231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 746165232.

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

Adding to 23131121231 its reverse (13212113132), we get a palindrome (36343234363).

The spelling of 23131121231 in words is "twenty-three billion, one hundred thirty-one million, one hundred twenty-one thousand, two hundred thirty-one".