12636863621 has 4 divisors (see below), whose sum is σ = 12796824000. Its totient is φ = 12476903244.

The previous prime is 12636863587. The next prime is 12636863641.

It is a happy number.

12636863621 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12636863621 - 2⁶ = 12636863557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12636863641) 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, 79980071 + ... + 79980228.

It is an arithmetic number, because the mean of its divisors is an integer number (3199206000).

Almost surely, 2^12636863621 is an apocalyptic number.

It is an amenable number.

12636863621 is a deficient number, since it is larger than the sum of its proper divisors (159960379).

12636863621 is an equidigital number, since it uses as much as digits as its factorization.

12636863621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159960378.

The product of its digits is 373248, while the sum is 44.

The spelling of 12636863621 in words is "twelve billion, six hundred thirty-six million, eight hundred sixty-three thousand, six hundred twenty-one".