844069650021 has 24 divisors (see below), whose sum is σ = 1313083347576. Its totient is φ = 519393409920.

The previous prime is 844069649933. The next prime is 844069650023. The reversal of 844069650021 is 120056960448.

844069650021 is a `hidden beast` number, since 84 + 4 + 0 + 69 + 6 + 500 + 2 + 1 = 666.

844069650021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 629457921 + 843440192100 = 25089^2 + 918390^2 .

It is not a de Polignac number, because 844069650021 - 2²¹ = 844067552869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (844069650023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1616751 + ... + 2074131.

It is an arithmetic number, because the mean of its divisors is an integer number (54711806149).

Almost surely, 2^844069650021 is an apocalyptic number.

It is an amenable number.

844069650021 is a deficient number, since it is larger than the sum of its proper divisors (469013697555).

844069650021 is a wasteful number, since it uses less digits than its factorization.

844069650021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473173 (or 473170 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 844069650021 in words is "eight hundred forty-four billion, sixty-nine million, six hundred fifty thousand, twenty-one".