9908221 has 2 divisors, whose sum is σ = 9908222. Its totient is φ = 9908220.

The previous prime is 9908207. The next prime is 9908231. The reversal of 9908221 is 1228099.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5112121 + 4796100 = 2261^2 + 2190^2 .

It is an emirp because it is prime and its reverse (1228099) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9908221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9908231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4954110 + 4954111.

It is an arithmetic number, because the mean of its divisors is an integer number (4954111).

Almost surely, 2^9908221 is an apocalyptic number.

It is an amenable number.

9908221 is a deficient number, since it is larger than the sum of its proper divisors (1).

9908221 is an equidigital number, since it uses as much as digits as its factorization.

9908221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 9908221 is about 3147.7326760702. The cubic root of 9908221 is about 214.7823360502.

The spelling of 9908221 in words is "nine million, nine hundred eight thousand, two hundred twenty-one".