23361521 has 4 divisors (see below), whose sum is σ = 23624100. Its totient is φ = 23098944.

The previous prime is 23361511. The next prime is 23361539. The reversal of 23361521 is 12516332.

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 8065600 + 15295921 = 2840^2 + 3911^2 .

It is a cyclic number.

It is not a de Polignac number, because 23361521 - 2¹⁰ = 23360497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23361511) 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, 131156 + ... + 131333.

It is an arithmetic number, because the mean of its divisors is an integer number (5906025).

Almost surely, 2^23361521 is an apocalyptic number.

It is an amenable number.

23361521 is a deficient number, since it is larger than the sum of its proper divisors (262579).

23361521 is an equidigital number, since it uses as much as digits as its factorization.

23361521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262578.

The product of its digits is 1080, while the sum is 23.

The square root of 23361521 is about 4833.3757354462. The cubic root of 23361521 is about 285.8689841172.

Adding to 23361521 its reverse (12516332), we get a palindrome (35877853).

The spelling of 23361521 in words is "twenty-three million, three hundred sixty-one thousand, five hundred twenty-one".