12644621 has 12 divisors (see below), whose sum is σ = 14351232. Its totient is φ = 11121000.

The previous prime is 12644591. The next prime is 12644669.

12644621 is nontrivially palindromic in base 10.

It is a de Polignac number, because none of the positive numbers 2^k-12644621 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 (12644921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2066 + ... + 5436.

It is an arithmetic number, because the mean of its divisors is an integer number (1195936).

Almost surely, 2^12644621 is an apocalyptic number.

12644621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12644621 is a deficient number, since it is larger than the sum of its proper divisors (1706611).

12644621 is a wasteful number, since it uses less digits than its factorization.

12644621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3424 (or 3413 counting only the distinct ones).

The product of its digits is 2304, while the sum is 26.

The square root of 12644621 is about 3555.9275864393. The cubic root of 12644621 is about 232.9710402586.

It can be divided in two parts, 1264 and 4621, that added together give a palindrome (5885).

The spelling of 12644621 in words is "twelve million, six hundred forty-four thousand, six hundred twenty-one".