6842021 has 2 divisors, whose sum is σ = 6842022. Its totient is φ = 6842020.

The previous prime is 6841993. The next prime is 6842023. The reversal of 6842021 is 1202486.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6832996 + 9025 = 2614^2 + 95^2 .

It is a cyclic number.

It is not a de Polignac number, because 6842021 - 2¹⁰ = 6840997 is a prime.

Together with 6842023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6842023) by changing a digit.

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

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3421010 + 3421011.

It is an arithmetic number, because the mean of its divisors is an integer number (3421011).

Almost surely, 2^6842021 is an apocalyptic number.

It is an amenable number.

6842021 is a deficient number, since it is larger than the sum of its proper divisors (1).

6842021 is an equidigital number, since it uses as much as digits as its factorization.

6842021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 6842021 is about 2615.7257119201. The cubic root of 6842021 is about 189.8430929877.

The spelling of 6842021 in words is "six million, eight hundred forty-two thousand, twenty-one".