23255721 has 16 divisors (see below), whose sum is σ = 35385600. Its totient is φ = 15084144.

The previous prime is 23255719. The next prime is 23255723. The reversal of 23255721 is 12755232.

It is an interprime number because it is at equal distance from previous prime (23255719) and next prime (23255723).

It is not a de Polignac number, because 23255721 - 2¹ = 23255719 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (23255723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10641 + ... + 12638.

It is an arithmetic number, because the mean of its divisors is an integer number (2211600).

Almost surely, 2^23255721 is an apocalyptic number.

It is an amenable number.

23255721 is a deficient number, since it is larger than the sum of its proper divisors (12129879).

23255721 is a wasteful number, since it uses less digits than its factorization.

23255721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23325 (or 23319 counting only the distinct ones).

The product of its digits is 4200, while the sum is 27.

The square root of 23255721 is about 4822.4185840717. The cubic root of 23255721 is about 285.4367817839.

The spelling of 23255721 in words is "twenty-three million, two hundred fifty-five thousand, seven hundred twenty-one".