12638752515021 has 32 divisors (see below), whose sum is σ = 17114004311040. Its totient is φ = 8295387910400.

The previous prime is 12638752514963. The next prime is 12638752515031. The reversal of 12638752515021 is 12051525783621.

It is a cyclic number.

It is not a de Polignac number, because 12638752515021 - 2¹⁴ = 12638752498637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12638752515031) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 329793541 + ... + 329831861.

It is an arithmetic number, because the mean of its divisors is an integer number (534812634720).

Almost surely, 2^{12638752515021} is an apocalyptic number.

It is an amenable number.

12638752515021 is a deficient number, since it is larger than the sum of its proper divisors (4475251796019).

12638752515021 is a wasteful number, since it uses less digits than its factorization.

12638752515021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42977.

The product of its (nonzero) digits is 1008000, while the sum is 48.

The spelling of 12638752515021 in words is "twelve trillion, six hundred thirty-eight billion, seven hundred fifty-two million, five hundred fifteen thousand, twenty-one".