12524221 has 4 divisors (see below), whose sum is σ = 12558172. Its totient is φ = 12490272.

The previous prime is 12524207. The next prime is 12524233. The reversal of 12524221 is 12242521.

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 7901721 + 4622500 = 2811^2 + 2150^2 .

It is a cyclic number.

It is not a de Polignac number, because 12524221 - 2¹¹ = 12522173 is a prime.

It is a super-2 number, since 2×12524221² = 313712223313682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12524251) 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, 16416 + ... + 17161.

It is an arithmetic number, because the mean of its divisors is an integer number (3139543).

Almost surely, 2^12524221 is an apocalyptic number.

It is an amenable number.

12524221 is a deficient number, since it is larger than the sum of its proper divisors (33951).

12524221 is an equidigital number, since it uses as much as digits as its factorization.

12524221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33950.

The product of its digits is 320, while the sum is 19.

The square root of 12524221 is about 3538.9576148917. The cubic root of 12524221 is about 232.2292435304.

Adding to 12524221 its reverse (12242521), we get a palindrome (24766742).

The spelling of 12524221 in words is "twelve million, five hundred twenty-four thousand, two hundred twenty-one".