23131220220013 has 2 divisors, whose sum is σ = 23131220220014. Its totient is φ = 23131220220012.

The previous prime is 23131220219999. The next prime is 23131220220019. The reversal of 23131220220013 is 31002202213132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22352593989609 + 778626230404 = 4727853^2 + 882398^2 .

It is a cyclic number.

It is not a de Polignac number, because 23131220220013 - 2²⁵ = 23131186665581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23131220220019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11565610110006 + 11565610110007.

It is an arithmetic number, because the mean of its divisors is an integer number (11565610110007).

Almost surely, 2^{23131220220013} is an apocalyptic number.

It is an amenable number.

23131220220013 is a deficient number, since it is larger than the sum of its proper divisors (1).

23131220220013 is an equidigital number, since it uses as much as digits as its factorization.

23131220220013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 23131220220013 its reverse (31002202213132), we get a palindrome (54133422433145).

The spelling of 23131220220013 in words is "twenty-three trillion, one hundred thirty-one billion, two hundred twenty million, two hundred twenty thousand, thirteen".