6821401 has 2 divisors, whose sum is σ = 6821402. Its totient is φ = 6821400.

The previous prime is 6821393. The next prime is 6821407. The reversal of 6821401 is 1041286.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3667225 + 3154176 = 1915^2 + 1776^2 .

It is a cyclic number.

It is not a de Polignac number, because 6821401 - 2³ = 6821393 is a prime.

It is not a weakly prime, because it can be changed into another prime (6821407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3410700 + 3410701.

It is an arithmetic number, because the mean of its divisors is an integer number (3410701).

Almost surely, 2^6821401 is an apocalyptic number.

It is an amenable number.

6821401 is a deficient number, since it is larger than the sum of its proper divisors (1).

6821401 is an equidigital number, since it uses as much as digits as its factorization.

6821401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 6821401 is about 2611.7811929792. The cubic root of 6821401 is about 189.6521891766.

Adding to 6821401 its reverse (1041286), we get a palindrome (7862687).

The spelling of 6821401 in words is "six million, eight hundred twenty-one thousand, four hundred one".