23131123121 has 4 divisors (see below), whose sum is σ = 23360144244. Its totient is φ = 22902102000.

The previous prime is 23131123111. The next prime is 23131123163. The reversal of 23131123121 is 12132113132.

It is a happy number.

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 13326162721 + 9804960400 = 115439^2 + 99020^2 .

It is a cyclic number.

It is not a de Polignac number, because 23131123121 - 2¹⁴ = 23131106737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23131123093 and 23131123102.

It is not an unprimeable number, because it can be changed into a prime (23131123111) 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, 114510410 + ... + 114510611.

It is an arithmetic number, because the mean of its divisors is an integer number (5840036061).

Almost surely, 2^23131123121 is an apocalyptic number.

It is an amenable number.

23131123121 is a deficient number, since it is larger than the sum of its proper divisors (229021123).

23131123121 is a wasteful number, since it uses less digits than its factorization.

23131123121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229021122.

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

Adding to 23131123121 its reverse (12132113132), we get a palindrome (35263236253).

The spelling of 23131123121 in words is "twenty-three billion, one hundred thirty-one million, one hundred twenty-three thousand, one hundred twenty-one".