23273521 has 4 divisors (see below), whose sum is σ = 23283700. Its totient is φ = 23263344.

The previous prime is 23273491. The next prime is 23273533. The reversal of 23273521 is 12537232.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 6553600 + 16719921 = 2560^2 + 4089^2 .

It is a cyclic number.

It is not a de Polignac number, because 23273521 - 2⁵ = 23273489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23273821) 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, 115 + ... + 6823.

It is an arithmetic number, because the mean of its divisors is an integer number (5820925).

Almost surely, 2^23273521 is an apocalyptic number.

It is an amenable number.

23273521 is a deficient number, since it is larger than the sum of its proper divisors (10179).

23273521 is an equidigital number, since it uses as much as digits as its factorization.

23273521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10178.

The product of its digits is 2520, while the sum is 25.

The square root of 23273521 is about 4824.2637780287. The cubic root of 23273521 is about 285.5095879404.

The spelling of 23273521 in words is "twenty-three million, two hundred seventy-three thousand, five hundred twenty-one".