6868021 has 2 divisors, whose sum is σ = 6868022. Its totient is φ = 6868020.

The previous prime is 6867997. The next prime is 6868039. The reversal of 6868021 is 1208686.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6687396 + 180625 = 2586^2 + 425^2 .

It is a cyclic number.

It is not a de Polignac number, because 6868021 - 2⁵ = 6867989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6868061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3434010 + 3434011.

It is an arithmetic number, because the mean of its divisors is an integer number (3434011).

Almost surely, 2^6868021 is an apocalyptic number.

It is an amenable number.

6868021 is a deficient number, since it is larger than the sum of its proper divisors (1).

6868021 is an equidigital number, since it uses as much as digits as its factorization.

6868021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 6868021 is about 2620.6909394280. The cubic root of 6868021 is about 190.0832599082.

The spelling of 6868021 in words is "six million, eight hundred sixty-eight thousand, twenty-one".