8104221 has 12 divisors (see below), whose sum is σ = 12022972. Its totient is φ = 5256576.

The previous prime is 8104219. The next prime is 8104231. The reversal of 8104221 is 1224018.

It can be written as a sum of positive squares in 2 ways, for example, as 7868025 + 236196 = 2805^2 + 486^2 .

It is not a de Polignac number, because 8104221 - 2¹ = 8104219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8104194 and 8104203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8104231) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11836 + ... + 12501.

Almost surely, 2^8104221 is an apocalyptic number.

It is an amenable number.

8104221 is a deficient number, since it is larger than the sum of its proper divisors (3918751).

8104221 is a wasteful number, since it uses less digits than its factorization.

8104221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24380 (or 24377 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 8104221 is about 2846.7913516800. The cubic root of 8104221 is about 200.8647638616.

Adding to 8104221 its reverse (1224018), we get a palindrome (9328239).

The spelling of 8104221 in words is "eight million, one hundred four thousand, two hundred twenty-one".