23131121 has 16 divisors (see below), whose sum is σ = 25589760. Its totient is φ = 20779200.

The previous prime is 23131111. The next prime is 23131181. The reversal of 23131121 is 12113132.

It is not a de Polignac number, because 23131121 - 2⁶ = 23131057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 23131096 and 23131105.

It is not an unprimeable number, because it can be changed into a prime (23131111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103616 + ... + 103838.

It is an arithmetic number, because the mean of its divisors is an integer number (1599360).

Almost surely, 2^23131121 is an apocalyptic number.

It is an amenable number.

23131121 is a deficient number, since it is larger than the sum of its proper divisors (2458639).

23131121 is a wasteful number, since it uses less digits than its factorization.

23131121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416.

The product of its digits is 36, while the sum is 14.

The square root of 23131121 is about 4809.4824045837. The cubic root of 23131121 is about 284.9260955392.

Adding to 23131121 its reverse (12113132), we get a palindrome (35244253).

The spelling of 23131121 in words is "twenty-three million, one hundred thirty-one thousand, one hundred twenty-one".