9888882221 has 2 divisors, whose sum is σ = 9888882222. Its totient is φ = 9888882220.

The previous prime is 9888882217. The next prime is 9888882277. The reversal of 9888882221 is 1222888889.

9888882221 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (9888882277) can be obtained adding 9888882221 to its sum of digits (56).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9798822121 + 90060100 = 98989^2 + 9490^2 .

It is a cyclic number.

It is not a de Polignac number, because 9888882221 - 2² = 9888882217 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9888812221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4944441110 + 4944441111.

It is an arithmetic number, because the mean of its divisors is an integer number (4944441111).

Almost surely, 2^9888882221 is an apocalyptic number.

It is an amenable number.

9888882221 is a deficient number, since it is larger than the sum of its proper divisors (1).

9888882221 is an equidigital number, since it uses as much as digits as its factorization.

9888882221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2359296, while the sum is 56.

The square root of 9888882221 is about 99442.8590749482. The cubic root of 9888882221 is about 2146.4250827816.

The spelling of 9888882221 in words is "nine billion, eight hundred eighty-eight million, eight hundred eighty-two thousand, two hundred twenty-one".