8910522722221 has 2 divisors, whose sum is σ = 8910522722222. Its totient is φ = 8910522722220.

The previous prime is 8910522722219. The next prime is 8910522722249. The reversal of 8910522722221 is 1222272250198.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7914291165225 + 996231556996 = 2813235^2 + 998114^2 .

It is a cyclic number.

It is not a de Polignac number, because 8910522722221 - 2¹ = 8910522722219 is a prime.

Together with 8910522722219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8910522720221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4455261361110 + 4455261361111.

It is an arithmetic number, because the mean of its divisors is an integer number (4455261361111).

Almost surely, 2^{8910522722221} is an apocalyptic number.

It is an amenable number.

8910522722221 is a deficient number, since it is larger than the sum of its proper divisors (1).

8910522722221 is an equidigital number, since it uses as much as digits as its factorization.

8910522722221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 161280, while the sum is 43.

The spelling of 8910522722221 in words is "eight trillion, nine hundred ten billion, five hundred twenty-two million, seven hundred twenty-two thousand, two hundred twenty-one".