23454721 has 16 divisors (see below), whose sum is σ = 25401600. Its totient is φ = 21590928.

The previous prime is 23454719. The next prime is 23454727. The reversal of 23454721 is 12745432.

It is a cyclic number.

It is not a de Polignac number, because 23454721 - 2¹ = 23454719 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23454721.

It is not an unprimeable number, because it can be changed into a prime (23454727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 168670 + ... + 168808.

It is an arithmetic number, because the mean of its divisors is an integer number (1587600).

Almost surely, 2^23454721 is an apocalyptic number.

It is an amenable number.

23454721 is a deficient number, since it is larger than the sum of its proper divisors (1946879).

23454721 is a wasteful number, since it uses less digits than its factorization.

23454721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348.

The product of its digits is 6720, while the sum is 28.

The square root of 23454721 is about 4843.0074334033. The cubic root of 23454721 is about 286.2486345860.

The spelling of 23454721 in words is "twenty-three million, four hundred fifty-four thousand, seven hundred twenty-one".