8915221 has 8 divisors (see below), whose sum is σ = 10341440. Its totient is φ = 7527168.

The previous prime is 8915213. The next prime is 8915243. The reversal of 8915221 is 1225198.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8915221 - 2³ = 8915213 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8915221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8915281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9036 + ... + 9973.

It is an arithmetic number, because the mean of its divisors is an integer number (1292680).

Almost surely, 2^8915221 is an apocalyptic number.

It is an amenable number.

8915221 is a deficient number, since it is larger than the sum of its proper divisors (1426219).

8915221 is a wasteful number, since it uses less digits than its factorization.

8915221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19083.

The product of its digits is 1440, while the sum is 28.

The square root of 8915221 is about 2985.8367336477. The cubic root of 8915221 is about 207.3531820573.

The spelling of 8915221 in words is "eight million, nine hundred fifteen thousand, two hundred twenty-one".