8840221 has 18 divisors (see below), whose sum is σ = 10224942. Its totient is φ = 7637760.

The previous prime is 8840213. The next prime is 8840231. The reversal of 8840221 is 1220488.

It can be written as a sum of positive squares in 9 ways, for example, as 4796100 + 4044121 = 2190^2 + 2011^2 .

It is not a de Polignac number, because 8840221 - 2³ = 8840213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8840201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 48751 + ... + 48931.

Almost surely, 2^8840221 is an apocalyptic number.

It is an amenable number.

8840221 is a deficient number, since it is larger than the sum of its proper divisors (1384721).

8840221 is a wasteful number, since it uses less digits than its factorization.

8840221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241 (or 211 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 8840221 is about 2973.2509144033. The cubic root of 8840221 is about 206.7700855382.

The spelling of 8840221 in words is "eight million, eight hundred forty thousand, two hundred twenty-one".