12621633504 has 24 divisors (see below), whose sum is σ = 33131788200. Its totient is φ = 4207211136.

The previous prime is 12621633503. The next prime is 12621633517. The reversal of 12621633504 is 40533612621.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12621633503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65737579 + ... + 65737770.

It is an arithmetic number, because the mean of its divisors is an integer number (1380491175).

Almost surely, 2^12621633504 is an apocalyptic number.

It is an amenable number.

12621633504 is an abundant number, since it is smaller than the sum of its proper divisors (20510154696).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12621633504 is a wasteful number, since it uses less digits than its factorization.

12621633504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131475362 (or 131475354 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 33.

The spelling of 12621633504 in words is "twelve billion, six hundred twenty-one million, six hundred thirty-three thousand, five hundred four".