844744455021 has 16 divisors (see below), whose sum is σ = 1127750906880. Its totient is φ = 562450659120.

The previous prime is 844744455001. The next prime is 844744455047. The reversal of 844744455021 is 120554447448.

It is not a de Polignac number, because 844744455021 - 2¹⁵ = 844744422253 is a prime.

It is a super-2 number, since 2×844744455021² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (844744455001) 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, 26047306 + ... + 26079716.

It is an arithmetic number, because the mean of its divisors is an integer number (70484431680).

Almost surely, 2^844744455021 is an apocalyptic number.

It is an amenable number.

844744455021 is a deficient number, since it is larger than the sum of its proper divisors (283006451859).

844744455021 is a wasteful number, since it uses less digits than its factorization.

844744455021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43136.

The product of its (nonzero) digits is 2867200, while the sum is 48.

The spelling of 844744455021 in words is "eight hundred forty-four billion, seven hundred forty-four million, four hundred fifty-five thousand, twenty-one".