12644121 has 16 divisors (see below), whose sum is σ = 19789184. Its totient is φ = 7029504.

The previous prime is 12644119. The next prime is 12644129. The reversal of 12644121 is 12144621.

It is a happy number.

12644121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12644121 - 2¹ = 12644119 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12644129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7360 + ... + 8913.

It is an arithmetic number, because the mean of its divisors is an integer number (1236824).

Almost surely, 2^12644121 is an apocalyptic number.

It is an amenable number.

12644121 is a deficient number, since it is larger than the sum of its proper divisors (7145063).

12644121 is a wasteful number, since it uses less digits than its factorization.

12644121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16320.

The product of its digits is 384, while the sum is 21.

The square root of 12644121 is about 3555.8572806006. The cubic root of 12644121 is about 232.9679694652.

Adding to 12644121 its reverse (12144621), we get a palindrome (24788742).

Subtracting from 12644121 its reverse (12144621), we obtain a triangular number (499500 = T₉₉₉).

The spelling of 12644121 in words is "twelve million, six hundred forty-four thousand, one hundred twenty-one".