23019568721 has 2 divisors, whose sum is σ = 23019568722. Its totient is φ = 23019568720.

The previous prime is 23019568703. The next prime is 23019568729. The reversal of 23019568721 is 12786591032.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12796134400 + 10223434321 = 113120^2 + 101111^2 .

It is a cyclic number.

It is not a de Polignac number, because 23019568721 - 2⁶ = 23019568657 is a prime.

It is not a weakly prime, because it can be changed into another prime (23019568729) 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, 11509784360 + 11509784361.

It is an arithmetic number, because the mean of its divisors is an integer number (11509784361).

Almost surely, 2^23019568721 is an apocalyptic number.

It is an amenable number.

23019568721 is a deficient number, since it is larger than the sum of its proper divisors (1).

23019568721 is an equidigital number, since it uses as much as digits as its factorization.

23019568721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 44.

The spelling of 23019568721 in words is "twenty-three billion, nineteen million, five hundred sixty-eight thousand, seven hundred twenty-one".