12544221 has 8 divisors (see below), whose sum is σ = 17177824. Its totient is φ = 8136720.

The previous prime is 12544219. The next prime is 12544229. The reversal of 12544221 is 12244521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12544221 - 2¹ = 12544219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12544229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56395 + ... + 56616.

It is an arithmetic number, because the mean of its divisors is an integer number (2147228).

Almost surely, 2^12544221 is an apocalyptic number.

It is an amenable number.

12544221 is a deficient number, since it is larger than the sum of its proper divisors (4633603).

12544221 is a wasteful number, since it uses less digits than its factorization.

12544221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113051.

The product of its digits is 640, while the sum is 21.

The square root of 12544221 is about 3541.7821785084. The cubic root of 12544221 is about 232.3527938558.

Adding to 12544221 its reverse (12244521), we get a palindrome (24788742).

The spelling of 12544221 in words is "twelve million, five hundred forty-four thousand, two hundred twenty-one".