12844633644821 has 16 divisors (see below), whose sum is σ = 14032589817600. Its totient is φ = 11660061268800.

The previous prime is 12844633644797. The next prime is 12844633644853.

12844633644821 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 12844633644821 - 2¹⁸ = 12844633382677 is a prime.

It is a super-2 number, since 2×12844633644821² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12844633646821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38397716 + ... + 38730786.

It is an arithmetic number, because the mean of its divisors is an integer number (877036863600).

Almost surely, 2^{12844633644821} is an apocalyptic number.

12844633644821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12844633644821 is a deficient number, since it is larger than the sum of its proper divisors (1187956172779).

12844633644821 is a wasteful number, since it uses less digits than its factorization.

12844633644821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338140.

The product of its digits is 21233664, while the sum is 56.

The spelling of 12844633644821 in words is "twelve trillion, eight hundred forty-four billion, six hundred thirty-three million, six hundred forty-four thousand, eight hundred twenty-one".