8320221 has 24 divisors (see below), whose sum is σ = 14792960. Its totient is φ = 4388256.

The previous prime is 8320219. The next prime is 8320229. The reversal of 8320221 is 1220238.

It is a happy number.

8320221 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 8320221 - 2¹ = 8320219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8320194 and 8320203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8320229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4261 + ... + 5898.

Almost surely, 2^8320221 is an apocalyptic number.

It is an amenable number.

8320221 is a deficient number, since it is larger than the sum of its proper divisors (6472739).

8320221 is a wasteful number, since it uses less digits than its factorization.

8320221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10185 (or 10182 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 8320221 is about 2884.4793290991. The cubic root of 8320221 is about 202.6336748846.

Adding to 8320221 its reverse (1220238), we get a palindrome (9540459).

The spelling of 8320221 in words is "eight million, three hundred twenty thousand, two hundred twenty-one".