23238521 has 4 divisors (see below), whose sum is σ = 23324544. Its totient is φ = 23152500.

The previous prime is 23238503. The next prime is 23238557. The reversal of 23238521 is 12583232.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 23238521 - 2¹⁴ = 23222137 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23235521) 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, 42605 + ... + 43146.

It is an arithmetic number, because the mean of its divisors is an integer number (5831136).

Almost surely, 2^23238521 is an apocalyptic number.

It is an amenable number.

23238521 is a deficient number, since it is larger than the sum of its proper divisors (86023).

23238521 is an equidigital number, since it uses as much as digits as its factorization.

23238521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86022.

The product of its digits is 2880, while the sum is 26.

The square root of 23238521 is about 4820.6349166889. The cubic root of 23238521 is about 285.3663944657.

The spelling of 23238521 in words is "twenty-three million, two hundred thirty-eight thousand, five hundred twenty-one".