99984221 has 2 divisors, whose sum is σ = 99984222. Its totient is φ = 99984220.

The previous prime is 99984211. The next prime is 99984239. The reversal of 99984221 is 12248999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51681721 + 48302500 = 7189^2 + 6950^2 .

It is a cyclic number.

It is not a de Polignac number, because 99984221 - 2¹⁰ = 99983197 is a prime.

It is a Sophie Germain prime.

It is a Chen 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 (99984211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49992110 + 49992111.

It is an arithmetic number, because the mean of its divisors is an integer number (49992111).

Almost surely, 2^99984221 is an apocalyptic number.

It is an amenable number.

99984221 is a deficient number, since it is larger than the sum of its proper divisors (1).

99984221 is an equidigital number, since it uses as much as digits as its factorization.

99984221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 44.

The square root of 99984221 is about 9999.2110188754. The cubic root of 99984221 is about 464.1344688670.

The spelling of 99984221 in words is "ninety-nine million, nine hundred eighty-four thousand, two hundred twenty-one".