9810221 has 2 divisors, whose sum is σ = 9810222. Its totient is φ = 9810220.

The previous prime is 9810209. The next prime is 9810239. The reversal of 9810221 is 1220189.

9810221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6817321 + 2992900 = 2611^2 + 1730^2 .

It is a cyclic number.

It is not a de Polignac number, because 9810221 - 2¹⁰ = 9809197 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9810271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4905110 + 4905111.

It is an arithmetic number, because the mean of its divisors is an integer number (4905111).

Almost surely, 2^9810221 is an apocalyptic number.

It is an amenable number.

9810221 is a deficient number, since it is larger than the sum of its proper divisors (1).

9810221 is an equidigital number, since it uses as much as digits as its factorization.

9810221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 9810221 is about 3132.1272324093. The cubic root of 9810221 is about 214.0718671483.

The spelling of 9810221 in words is "nine million, eight hundred ten thousand, two hundred twenty-one".