23503121 has 4 divisors (see below), whose sum is σ = 23587044. Its totient is φ = 23419200.

The previous prime is 23503087. The next prime is 23503147. The reversal of 23503121 is 12130532.

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 5107600 + 18395521 = 2260^2 + 4289^2 .

It is a cyclic number.

It is not a de Polignac number, because 23503121 - 2¹⁰ = 23502097 is a prime.

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 23503121.

It is not an unprimeable number, because it can be changed into a prime (23503321) 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, 41540 + ... + 42101.

It is an arithmetic number, because the mean of its divisors is an integer number (5896761).

Almost surely, 2^23503121 is an apocalyptic number.

It is an amenable number.

23503121 is a deficient number, since it is larger than the sum of its proper divisors (83923).

23503121 is an equidigital number, since it uses as much as digits as its factorization.

23503121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83922.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 23503121 is about 4848.0017533000. The cubic root of 23503121 is about 286.4453954719.

Subtracting from 23503121 its sum of digits (17), we obtain a square (23503104 = 4848²).

Adding to 23503121 its reverse (12130532), we get a palindrome (35633653).

The spelling of 23503121 in words is "twenty-three million, five hundred three thousand, one hundred twenty-one".