12643444434621 has 32 divisors (see below), whose sum is σ = 22634418014208. Its totient is φ = 6062790536640.

The previous prime is 12643444434619. The next prime is 12643444434631.

12643444434621 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 12643444434621 - 2¹ = 12643444434619 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12643444434631) 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, 2105132601 + ... + 2105138606.

It is an arithmetic number, because the mean of its divisors is an integer number (707325562944).

Almost surely, 2^{12643444434621} is an apocalyptic number.

12643444434621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12643444434621 is a deficient number, since it is larger than the sum of its proper divisors (9990973579587).

12643444434621 is a wasteful number, since it uses less digits than its factorization.

12643444434621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4210271241.

The product of its digits is 5308416, while the sum is 48.

It can be divided in two parts, 1264344 and 4434621, that added together give a palindrome (5698965).

The spelling of 12643444434621 in words is "twelve trillion, six hundred forty-three billion, four hundred forty-four million, four hundred thirty-four thousand, six hundred twenty-one".