23400204721 has 2 divisors, whose sum is σ = 23400204722. Its totient is φ = 23400204720.

The previous prime is 23400204713. The next prime is 23400204733. The reversal of 23400204721 is 12740200432.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22721341696 + 678863025 = 150736^2 + 26055^2 .

It is a cyclic number.

It is not a de Polignac number, because 23400204721 - 2³ = 23400204713 is a prime.

It is not a weakly prime, because it can be changed into another prime (23400204791) 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, 11700102360 + 11700102361.

It is an arithmetic number, because the mean of its divisors is an integer number (11700102361).

Almost surely, 2^23400204721 is an apocalyptic number.

It is an amenable number.

23400204721 is a deficient number, since it is larger than the sum of its proper divisors (1).

23400204721 is an equidigital number, since it uses as much as digits as its factorization.

23400204721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 25.

The spelling of 23400204721 in words is "twenty-three billion, four hundred million, two hundred four thousand, seven hundred twenty-one".