12644244621 has 12 divisors (see below), whose sum is σ = 19225167520. Its totient is φ = 7985838600.

The previous prime is 12644244601. The next prime is 12644244637.

12644244621 is a `hidden beast` number, since 1 + 2 + 6 + 4 + 4 + 24 + 4 + 621 = 666.

12644244621 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 12644244621 - 2¹¹ = 12644242573 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 (12644244601) 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, 36971305 + ... + 36971646.

Almost surely, 2^12644244621 is an apocalyptic number.

It is an amenable number.

12644244621 is a deficient number, since it is larger than the sum of its proper divisors (6580922899).

12644244621 is a wasteful number, since it uses less digits than its factorization.

12644244621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73942976 (or 73942973 counting only the distinct ones).

The product of its digits is 73728, while the sum is 36.

The spelling of 12644244621 in words is "twelve billion, six hundred forty-four million, two hundred forty-four thousand, six hundred twenty-one".