9868021 has 2 divisors, whose sum is σ = 9868022. Its totient is φ = 9868020.

The previous prime is 9868009. The next prime is 9868037. The reversal of 9868021 is 1208689.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7263025 + 2604996 = 2695^2 + 1614^2 .

It is an emirp because it is prime and its reverse (1208689) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9868021 - 2¹⁵ = 9835253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9868051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4934010 + 4934011.

It is an arithmetic number, because the mean of its divisors is an integer number (4934011).

Almost surely, 2^9868021 is an apocalyptic number.

It is an amenable number.

9868021 is a deficient number, since it is larger than the sum of its proper divisors (1).

9868021 is an equidigital number, since it uses as much as digits as its factorization.

9868021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 9868021 is about 3141.3406373712. The cubic root of 9868021 is about 214.4914680472.

The spelling of 9868021 in words is "nine million, eight hundred sixty-eight thousand, twenty-one".