8704221 has 16 divisors (see below), whose sum is σ = 12415104. Its totient is φ = 5405184.

The previous prime is 8704219. The next prime is 8704229. The reversal of 8704221 is 1224078.

It is not a de Polignac number, because 8704221 - 2¹ = 8704219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8704191 and 8704200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8704229) 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, 4425 + ... + 6081.

It is an arithmetic number, because the mean of its divisors is an integer number (775944).

Almost surely, 2^8704221 is an apocalyptic number.

It is an amenable number.

8704221 is a deficient number, since it is larger than the sum of its proper divisors (3710883).

8704221 is a wasteful number, since it uses less digits than its factorization.

8704221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1780.

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 8704221 is about 2950.2916804953. The cubic root of 8704221 is about 205.7042682098.

Adding to 8704221 its reverse (1224078), we get a palindrome (9928299).

The spelling of 8704221 in words is "eight million, seven hundred four thousand, two hundred twenty-one".