23521564321 has 2 divisors, whose sum is σ = 23521564322. Its totient is φ = 23521564320.

The previous prime is 23521564243. The next prime is 23521564333. The reversal of 23521564321 is 12346512532.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17540088721 + 5981475600 = 132439^2 + 77340^2 .

It is a cyclic number.

It is not a de Polignac number, because 23521564321 - 2⁹ = 23521563809 is a prime.

It is not a weakly prime, because it can be changed into another prime (23521561321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11760782160 + 11760782161.

It is an arithmetic number, because the mean of its divisors is an integer number (11760782161).

Almost surely, 2^23521564321 is an apocalyptic number.

It is an amenable number.

23521564321 is a deficient number, since it is larger than the sum of its proper divisors (1).

23521564321 is an equidigital number, since it uses as much as digits as its factorization.

23521564321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43200, while the sum is 34.

The spelling of 23521564321 in words is "twenty-three billion, five hundred twenty-one million, five hundred sixty-four thousand, three hundred twenty-one".