9810200221 has 2 divisors, whose sum is σ = 9810200222. Its totient is φ = 9810200220.

The previous prime is 9810200209. The next prime is 9810200249. The reversal of 9810200221 is 1220020189.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5042988196 + 4767212025 = 71014^2 + 69045^2 .

It is an emirp because it is prime and its reverse (1220020189) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9810200221 - 2²⁵ = 9776645789 is a prime.

It is a super-2 number, since 2×9810200221² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9810200291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4905100110 + 4905100111.

It is an arithmetic number, because the mean of its divisors is an integer number (4905100111).

Almost surely, 2^9810200221 is an apocalyptic number.

It is an amenable number.

9810200221 is a deficient number, since it is larger than the sum of its proper divisors (1).

9810200221 is an equidigital number, since it uses as much as digits as its factorization.

9810200221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 9810200221 is about 99046.4548633620. The cubic root of 9810200221 is about 2140.7171600654.

The spelling of 9810200221 in words is "nine billion, eight hundred ten million, two hundred thousand, two hundred twenty-one".