12844050921 has 24 divisors (see below), whose sum is σ = 20177471496. Its totient is φ = 7825766400.

The previous prime is 12844050887. The next prime is 12844050971. The reversal of 12844050921 is 12905044821.

12844050921 is a `hidden beast` number, since 12 + 84 + 40 + 509 + 21 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 3095253225 + 9748797696 = 55635^2 + 98736^2 .

It is not a de Polignac number, because 12844050921 - 2²⁷ = 12709833193 is a prime.

It is a super-2 number, since 2×12844050921² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12844050971) 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 23 ways as a sum of consecutive naturals, for example, 531640 + ... + 555273.

It is an arithmetic number, because the mean of its divisors is an integer number (840727979).

Almost surely, 2^12844050921 is an apocalyptic number.

It is an amenable number.

12844050921 is a deficient number, since it is larger than the sum of its proper divisors (7333420575).

12844050921 is a wasteful number, since it uses less digits than its factorization.

12844050921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1087033 (or 1087030 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The spelling of 12844050921 in words is "twelve billion, eight hundred forty-four million, fifty thousand, nine hundred twenty-one".