9802116221 has 2 divisors, whose sum is σ = 9802116222. Its totient is φ = 9802116220.

The previous prime is 9802116211. The next prime is 9802116223. The reversal of 9802116221 is 1226112089.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9778243225 + 23872996 = 98885^2 + 4886^2 .

It is an emirp because it is prime and its reverse (1226112089) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9802116221 - 2¹⁴ = 9802099837 is a prime.

Together with 9802116223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9802116223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4901058110 + 4901058111.

It is an arithmetic number, because the mean of its divisors is an integer number (4901058111).

Almost surely, 2^9802116221 is an apocalyptic number.

It is an amenable number.

9802116221 is a deficient number, since it is larger than the sum of its proper divisors (1).

9802116221 is an equidigital number, since it uses as much as digits as its factorization.

9802116221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 9802116221 is about 99005.6373192961. The cubic root of 9802116221 is about 2140.1289860967.

The spelling of 9802116221 in words is "nine billion, eight hundred two million, one hundred sixteen thousand, two hundred twenty-one".