23530423185721 has 2 divisors, whose sum is σ = 23530423185722. Its totient is φ = 23530423185720.

The previous prime is 23530423185691. The next prime is 23530423185761. The reversal of 23530423185721 is 12758132403532.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22826273959225 + 704149226496 = 4777685^2 + 839136^2 .

It is a cyclic number.

It is not a de Polignac number, because 23530423185721 - 2³⁷ = 23392984232249 is a prime.

It is not a weakly prime, because it can be changed into another prime (23530423185761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11765211592860 + 11765211592861.

It is an arithmetic number, because the mean of its divisors is an integer number (11765211592861).

Almost surely, 2^{23530423185721} is an apocalyptic number.

It is an amenable number.

23530423185721 is a deficient number, since it is larger than the sum of its proper divisors (1).

23530423185721 is an equidigital number, since it uses as much as digits as its factorization.

23530423185721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1209600, while the sum is 46.

The spelling of 23530423185721 in words is "twenty-three trillion, five hundred thirty billion, four hundred twenty-three million, one hundred eighty-five thousand, seven hundred twenty-one".