6808421 has 2 divisors, whose sum is σ = 6808422. Its totient is φ = 6808420.

The previous prime is 6808409. The next prime is 6808427. The reversal of 6808421 is 1248086.

6808421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3880900 + 2927521 = 1970^2 + 1711^2 .

It is a cyclic number.

It is not a de Polignac number, because 6808421 - 2¹⁰ = 6807397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6808427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3404210 + 3404211.

It is an arithmetic number, because the mean of its divisors is an integer number (3404211).

Almost surely, 2^6808421 is an apocalyptic number.

It is an amenable number.

6808421 is a deficient number, since it is larger than the sum of its proper divisors (1).

6808421 is an equidigital number, since it uses as much as digits as its factorization.

6808421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 6808421 is about 2609.2951155437. The cubic root of 6808421 is about 189.5318205279.

The spelling of 6808421 in words is "six million, eight hundred eight thousand, four hundred twenty-one".