8855221 has 4 divisors (see below), whose sum is σ = 9071244. Its totient is φ = 8639200.

The previous prime is 8855183. The next prime is 8855239. The reversal of 8855221 is 1225588.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2852721 + 6002500 = 1689^2 + 2450^2 .

It is a cyclic number.

It is not a de Polignac number, because 8855221 - 2¹³ = 8847029 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

8855221 is a lucky 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 (8855261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107950 + ... + 108031.

It is an arithmetic number, because the mean of its divisors is an integer number (2267811).

Almost surely, 2^8855221 is an apocalyptic number.

It is an amenable number.

8855221 is a deficient number, since it is larger than the sum of its proper divisors (216023).

8855221 is a wasteful number, since it uses less digits than its factorization.

8855221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216022.

The product of its digits is 6400, while the sum is 31.

The square root of 8855221 is about 2975.7723367220. The cubic root of 8855221 is about 206.8869679370.

The spelling of 8855221 in words is "eight million, eight hundred fifty-five thousand, two hundred twenty-one".