8244221 has 2 divisors, whose sum is σ = 8244222. Its totient is φ = 8244220.

The previous prime is 8244209. The next prime is 8244263. The reversal of 8244221 is 1224428.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4687225 + 3556996 = 2165^2 + 1886^2 .

It is a cyclic number.

It is not a de Polignac number, because 8244221 - 2¹⁴ = 8227837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8246221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4122110 + 4122111.

It is an arithmetic number, because the mean of its divisors is an integer number (4122111).

Almost surely, 2^8244221 is an apocalyptic number.

It is an amenable number.

8244221 is a deficient number, since it is larger than the sum of its proper divisors (1).

8244221 is an equidigital number, since it uses as much as digits as its factorization.

8244221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1024, while the sum is 23.

The square root of 8244221 is about 2871.2751522625. The cubic root of 8244221 is about 202.0148095537.

Adding to 8244221 its reverse (1224428), we get a palindrome (9468649).

The spelling of 8244221 in words is "eight million, two hundred forty-four thousand, two hundred twenty-one".