23408617721 has 8 divisors (see below), whose sum is σ = 24787647720. Its totient is φ = 22029815808.

The previous prime is 23408617679. The next prime is 23408617723. The reversal of 23408617721 is 12771680432.

It can be written as a sum of positive squares in 4 ways, for example, as 12037381225 + 11371236496 = 109715^2 + 106636^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 23408617721 - 2⁶ = 23408617657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23408617723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 183245 + ... + 283541.

It is an arithmetic number, because the mean of its divisors is an integer number (3098455965).

Almost surely, 2^23408617721 is an apocalyptic number.

It is an amenable number.

23408617721 is a deficient number, since it is larger than the sum of its proper divisors (1379029999).

23408617721 is a wasteful number, since it uses less digits than its factorization.

23408617721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114043.

The product of its (nonzero) digits is 112896, while the sum is 41.

The spelling of 23408617721 in words is "twenty-three billion, four hundred eight million, six hundred seventeen thousand, seven hundred twenty-one".