23131320144021 has 6 divisors (see below), whose sum is σ = 33411906874710. Its totient is φ = 15420880096008.

The previous prime is 23131320143983. The next prime is 23131320144139. The reversal of 23131320144021 is 12044102313132.

23131320144021 is a `hidden beast` number, since 2 + 3 + 1 + 3 + 13 + 201 + 440 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 18463607424900 + 4667712719121 = 4296930^2 + 2160489^2 .

It is not a de Polignac number, because 23131320144021 - 2²³ = 23131311755413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23131320144221) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1285073341326 + ... + 1285073341343.

It is an arithmetic number, because the mean of its divisors is an integer number (5568651145785).

Almost surely, 2^{23131320144021} is an apocalyptic number.

It is an amenable number.

23131320144021 is a deficient number, since it is larger than the sum of its proper divisors (10280586730689).

23131320144021 is a wasteful number, since it uses less digits than its factorization.

23131320144021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2570146682675 (or 2570146682672 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

Adding to 23131320144021 its reverse (12044102313132), we get a palindrome (35175422457153).

The spelling of 23131320144021 in words is "twenty-three trillion, one hundred thirty-one billion, three hundred twenty million, one hundred forty-four thousand, twenty-one".