23410721 has 4 divisors (see below), whose sum is σ = 23540244. Its totient is φ = 23281200.

The previous prime is 23410691. The next prime is 23410733. The reversal of 23410721 is 12701432.

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 3474496 + 19936225 = 1864^2 + 4465^2 .

It is a cyclic number.

It is not a de Polignac number, because 23410721 - 2¹⁴ = 23394337 is a prime.

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

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 23410693 and 23410702.

It is not an unprimeable number, because it can be changed into a prime (23410771) 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, 64490 + ... + 64851.

It is an arithmetic number, because the mean of its divisors is an integer number (5885061).

Almost surely, 2^23410721 is an apocalyptic number.

It is an amenable number.

23410721 is a deficient number, since it is larger than the sum of its proper divisors (129523).

23410721 is a wasteful number, since it uses less digits than its factorization.

23410721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129522.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 23410721 is about 4838.4626690717. The cubic root of 23410721 is about 286.0695260249.

The spelling of 23410721 in words is "twenty-three million, four hundred ten thousand, seven hundred twenty-one".