8508221 has 4 divisors (see below), whose sum is σ = 8616000. Its totient is φ = 8400444.

The previous prime is 8508217. The next prime is 8508251. The reversal of 8508221 is 1228058.

8508221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8508221 - 2² = 8508217 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8508251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53771 + ... + 53928.

It is an arithmetic number, because the mean of its divisors is an integer number (2154000).

Almost surely, 2^8508221 is an apocalyptic number.

It is an amenable number.

8508221 is a deficient number, since it is larger than the sum of its proper divisors (107779).

8508221 is a wasteful number, since it uses less digits than its factorization.

8508221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107778.

The product of its (nonzero) digits is 1280, while the sum is 26.

The square root of 8508221 is about 2916.8854965528. The cubic root of 8508221 is about 204.1485285752.

The spelling of 8508221 in words is "eight million, five hundred eight thousand, two hundred twenty-one".