8016221 has 2 divisors, whose sum is σ = 8016222. Its totient is φ = 8016220.

The previous prime is 8016191. The next prime is 8016247. The reversal of 8016221 is 1226108.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6180196 + 1836025 = 2486^2 + 1355^2 .

It is a cyclic number.

It is not a de Polignac number, because 8016221 - 2¹⁸ = 7754077 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 8016193 and 8016202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8010221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4008110 + 4008111.

It is an arithmetic number, because the mean of its divisors is an integer number (4008111).

Almost surely, 2^8016221 is an apocalyptic number.

It is an amenable number.

8016221 is a deficient number, since it is larger than the sum of its proper divisors (1).

8016221 is an equidigital number, since it uses as much as digits as its factorization.

8016221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 8016221 is about 2831.2931674413. The cubic root of 8016221 is about 200.1350837414.

The spelling of 8016221 in words is "eight million, sixteen thousand, two hundred twenty-one".