9210221 has 2 divisors, whose sum is σ = 9210222. Its totient is φ = 9210220.

The previous prime is 9210203. The next prime is 9210233. The reversal of 9210221 is 1220129.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9084196 + 126025 = 3014^2 + 355^2 .

It is a cyclic number.

It is not a de Polignac number, because 9210221 - 2¹⁴ = 9193837 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9210221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9210241) 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 as a sum of consecutive naturals, namely, 4605110 + 4605111.

It is an arithmetic number, because the mean of its divisors is an integer number (4605111).

Almost surely, 2^9210221 is an apocalyptic number.

It is an amenable number.

9210221 is a deficient number, since it is larger than the sum of its proper divisors (1).

9210221 is an equidigital number, since it uses as much as digits as its factorization.

9210221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 9210221 is about 3034.8345918682. The cubic root of 9210221 is about 209.6154792702.

The spelling of 9210221 in words is "nine million, two hundred ten thousand, two hundred twenty-one".