844221 has 12 divisors (see below), whose sum is σ = 1309632. Its totient is φ = 482328.

The previous prime is 844201. The next prime is 844243. The reversal of 844221 is 122448.

It is not a de Polignac number, because 844221 - 2⁶ = 844157 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (844201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2725 + ... + 3018.

It is an arithmetic number, because the mean of its divisors is an integer number (109136).

2⁸⁴⁴²²¹ is an apocalyptic number.

It is an amenable number.

844221 is a deficient number, since it is larger than the sum of its proper divisors (465411).

844221 is a wasteful number, since it uses less digits than its factorization.

844221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5760 (or 5753 counting only the distinct ones).

The product of its digits is 512, while the sum is 21.

The square root of 844221 is about 918.8149977008. The cubic root of 844221 is about 94.5116583696.

Adding to 844221 its reverse (122448), we get a palindrome (966669).

The spelling of 844221 in words is "eight hundred forty-four thousand, two hundred twenty-one".