23253521 has 4 divisors (see below), whose sum is σ = 23320500. Its totient is φ = 23186544.

The previous prime is 23253509. The next prime is 23253523. The reversal of 23253521 is 12535232.

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 11316496 + 11937025 = 3364^2 + 3455^2 .

It is a cyclic number.

It is not a de Polignac number, because 23253521 - 2¹⁰ = 23252497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23253523) 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, 32966 + ... + 33663.

It is an arithmetic number, because the mean of its divisors is an integer number (5830125).

Almost surely, 2^23253521 is an apocalyptic number.

It is an amenable number.

23253521 is a deficient number, since it is larger than the sum of its proper divisors (66979).

23253521 is an equidigital number, since it uses as much as digits as its factorization.

23253521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66978.

The product of its digits is 1800, while the sum is 23.

The square root of 23253521 is about 4822.1904773661. The cubic root of 23253521 is about 285.4277806909.

Adding to 23253521 its reverse (12535232), we get a palindrome (35788753).

It can be divided in two parts, 2 and 3253521, that added together give a palindrome (3253523).

The spelling of 23253521 in words is "twenty-three million, two hundred fifty-three thousand, five hundred twenty-one".