9890210221 has 2 divisors, whose sum is σ = 9890210222. Its totient is φ = 9890210220.

The previous prime is 9890210191. The next prime is 9890210237. The reversal of 9890210221 is 1220120989.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8283002121 + 1607208100 = 91011^2 + 40090^2 .

It is an emirp because it is prime and its reverse (1220120989) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9890210221 - 2⁷ = 9890210093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9890214221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4945105110 + 4945105111.

It is an arithmetic number, because the mean of its divisors is an integer number (4945105111).

Almost surely, 2^9890210221 is an apocalyptic number.

It is an amenable number.

9890210221 is a deficient number, since it is larger than the sum of its proper divisors (1).

9890210221 is an equidigital number, since it uses as much as digits as its factorization.

9890210221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 9890210221 is about 99449.5360522109. The cubic root of 9890210221 is about 2146.5211612145.

The spelling of 9890210221 in words is "nine billion, eight hundred ninety million, two hundred ten thousand, two hundred twenty-one".