8364221 has 4 divisors (see below), whose sum is σ = 8856252. Its totient is φ = 7872192.

The previous prime is 8364217. The next prime is 8364227. The reversal of 8364221 is 1224638.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1224638 = 2 ⋅612319.

It can be written as a sum of positive squares in 2 ways, for example, as 5707321 + 2656900 = 2389^2 + 1630^2 .

It is a cyclic number.

It is not a de Polignac number, because 8364221 - 2² = 8364217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8364227) 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, 245990 + ... + 246023.

It is an arithmetic number, because the mean of its divisors is an integer number (2214063).

Almost surely, 2^8364221 is an apocalyptic number.

It is an amenable number.

8364221 is a deficient number, since it is larger than the sum of its proper divisors (492031).

8364221 is a wasteful number, since it uses less digits than its factorization.

8364221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492030.

The product of its digits is 2304, while the sum is 26.

The square root of 8364221 is about 2892.0962985350. The cubic root of 8364221 is about 202.9902443806.

Adding to 8364221 its reverse (1224638), we get a palindrome (9588859).

The spelling of 8364221 in words is "eight million, three hundred sixty-four thousand, two hundred twenty-one".