8504221 has 16 divisors (see below), whose sum is σ = 9797760. Its totient is φ = 7309120.

The previous prime is 8504203. The next prime is 8504231. The reversal of 8504221 is 1224058.

It is a cyclic number.

It is not a de Polignac number, because 8504221 - 2⁵ = 8504189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8504192 and 8504201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8504231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16656 + ... + 17158.

It is an arithmetic number, because the mean of its divisors is an integer number (612360).

Almost surely, 2^8504221 is an apocalyptic number.

It is an amenable number.

8504221 is a deficient number, since it is larger than the sum of its proper divisors (1293539).

8504221 is a wasteful number, since it uses less digits than its factorization.

8504221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 596.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 8504221 is about 2916.1997531033. The cubic root of 8504221 is about 204.1165312039.

Adding to 8504221 its reverse (1224058), we get a palindrome (9728279).

The spelling of 8504221 in words is "eight million, five hundred four thousand, two hundred twenty-one".