12638619021 has 32 divisors (see below), whose sum is σ = 19972051200. Its totient is φ = 6955845120.

The previous prime is 12638618999. The next prime is 12638619029. The reversal of 12638619021 is 12091683621.

It is not a de Polignac number, because 12638619021 - 2⁷ = 12638618893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12638619029) 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, 223711 + ... + 274451.

It is an arithmetic number, because the mean of its divisors is an integer number (624126600).

Almost surely, 2^12638619021 is an apocalyptic number.

It is an amenable number.

12638619021 is a deficient number, since it is larger than the sum of its proper divisors (7333432179).

12638619021 is a wasteful number, since it uses less digits than its factorization.

12638619021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51189.

The product of its (nonzero) digits is 31104, while the sum is 39.

The spelling of 12638619021 in words is "twelve billion, six hundred thirty-eight million, six hundred nineteen thousand, twenty-one".