23130320021 has 2 divisors, whose sum is σ = 23130320022. Its totient is φ = 23130320020.

The previous prime is 23130320011. The next prime is 23130320029. The reversal of 23130320021 is 12002303132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22564546225 + 565773796 = 150215^2 + 23786^2 .

It is a cyclic number.

It is not a de Polignac number, because 23130320021 - 2²² = 23126125717 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23130320029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11565160010 + 11565160011.

It is an arithmetic number, because the mean of its divisors is an integer number (11565160011).

Almost surely, 2^23130320021 is an apocalyptic number.

It is an amenable number.

23130320021 is a deficient number, since it is larger than the sum of its proper divisors (1).

23130320021 is an equidigital number, since it uses as much as digits as its factorization.

23130320021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 23130320021 its reverse (12002303132), we get a palindrome (35132623153).

The spelling of 23130320021 in words is "twenty-three billion, one hundred thirty million, three hundred twenty thousand, twenty-one".