8644221 has 12 divisors (see below), whose sum is σ = 13143520. Its totient is φ = 5459400.

The previous prime is 8644213. The next prime is 8644231. The reversal of 8644221 is 1224468.

It is not a de Polignac number, because 8644221 - 2³ = 8644213 is a prime.

It is a Duffinian 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 (8644231) 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, 25105 + ... + 25446.

Almost surely, 2^8644221 is an apocalyptic number.

It is an amenable number.

8644221 is a deficient number, since it is larger than the sum of its proper divisors (4499299).

8644221 is a wasteful number, since it uses less digits than its factorization.

8644221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50576 (or 50573 counting only the distinct ones).

The product of its digits is 3072, while the sum is 27.

The square root of 8644221 is about 2940.1056103480. The cubic root of 8644221 is about 205.2305239410.

Adding to 8644221 its reverse (1224468), we get a palindrome (9868689).

The spelling of 8644221 in words is "eight million, six hundred forty-four thousand, two hundred twenty-one".