12838636721 has 8 divisors (see below), whose sum is σ = 13457631264. Its totient is φ = 12234206880.

The previous prime is 12838636687. The next prime is 12838636739. The reversal of 12838636721 is 12763683821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12838636721 - 2¹⁰ = 12838635697 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12838635721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3639371 + ... + 3642896.

It is an arithmetic number, because the mean of its divisors is an integer number (1682203908).

Almost surely, 2^12838636721 is an apocalyptic number.

It is an amenable number.

12838636721 is a deficient number, since it is larger than the sum of its proper divisors (618994543).

12838636721 is an equidigital number, since it uses as much as digits as its factorization.

12838636721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7282351.

The product of its digits is 580608, while the sum is 47.

The spelling of 12838636721 in words is "twelve billion, eight hundred thirty-eight million, six hundred thirty-six thousand, seven hundred twenty-one".