12633633621 has 24 divisors (see below), whose sum is σ = 20890286144. Its totient is φ = 7207185600.

The previous prime is 12633633601. The next prime is 12633633641.

12633633621 is a `hidden beast` number, since 1 + 26 + 3 + 3 + 6 + 3 + 3 + 621 = 666.

12633633621 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (12633633601) and next prime (12633633641).

It is not a de Polignac number, because 12633633621 - 2¹⁰ = 12633632597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12633633601) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 128971 + ... + 204696.

Almost surely, 2^12633633621 is an apocalyptic number.

It is an amenable number.

12633633621 is a deficient number, since it is larger than the sum of its proper divisors (8256652523).

12633633621 is a wasteful number, since it uses less digits than its factorization.

12633633621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334281 (or 334278 counting only the distinct ones).

The product of its digits is 69984, while the sum is 36.

The spelling of 12633633621 in words is "twelve billion, six hundred thirty-three million, six hundred thirty-three thousand, six hundred twenty-one".