23385580721 has 4 divisors (see below), whose sum is σ = 23385971700. Its totient is φ = 23385189744.

The previous prime is 23385580661. The next prime is 23385580723. The reversal of 23385580721 is 12708558332.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6372030625 + 17013550096 = 79825^2 + 130436^2 .

It is a cyclic number.

It is not a de Polignac number, because 23385580721 - 2¹⁰ = 23385579697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23385580723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84926 + ... + 232343.

It is an arithmetic number, because the mean of its divisors is an integer number (5846492925).

Almost surely, 2^23385580721 is an apocalyptic number.

It is an amenable number.

23385580721 is a deficient number, since it is larger than the sum of its proper divisors (390979).

23385580721 is an equidigital number, since it uses as much as digits as its factorization.

23385580721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390978.

The product of its (nonzero) digits is 403200, while the sum is 44.

The spelling of 23385580721 in words is "twenty-three billion, three hundred eighty-five million, five hundred eighty thousand, seven hundred twenty-one".