8358221 has 4 divisors (see below), whose sum is σ = 8365500. Its totient is φ = 8350944.

The previous prime is 8358197. The next prime is 8358227. The reversal of 8358221 is 1228538.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1525225 + 6832996 = 1235^2 + 2614^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8358221 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 (8358227) 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, 1496 + ... + 4353.

It is an arithmetic number, because the mean of its divisors is an integer number (2091375).

Almost surely, 2^8358221 is an apocalyptic number.

It is an amenable number.

8358221 is a deficient number, since it is larger than the sum of its proper divisors (7279).

8358221 is a wasteful number, since it uses less digits than its factorization.

8358221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7278.

The product of its digits is 3840, while the sum is 29.

The square root of 8358221 is about 2891.0588025843. The cubic root of 8358221 is about 202.9416950174.

The spelling of 8358221 in words is "eight million, three hundred fifty-eight thousand, two hundred twenty-one".