8228221 has 8 divisors (see below), whose sum is σ = 8740224. Its totient is φ = 7719360.

The previous prime is 8228201. The next prime is 8228263. The reversal of 8228221 is 1228228.

8228221 is nontrivially palindromic in base 13.

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

It is not a de Polignac number, because 8228221 - 2⁵ = 8228189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8228201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6766 + ... + 7888.

It is an arithmetic number, because the mean of its divisors is an integer number (1092528).

Almost surely, 2^8228221 is an apocalyptic number.

It is an amenable number.

8228221 is a deficient number, since it is larger than the sum of its proper divisors (512003).

8228221 is a wasteful number, since it uses less digits than its factorization.

8228221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1571.

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

The square root of 8228221 is about 2868.4875805902. The cubic root of 8228221 is about 201.8840379420.

The spelling of 8228221 in words is "eight million, two hundred twenty-eight thousand, two hundred twenty-one".