6827221 has 4 divisors (see below), whose sum is σ = 6835500. Its totient is φ = 6818944.

The previous prime is 6827201. The next prime is 6827231. The reversal of 6827221 is 1227286.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1920996 + 4906225 = 1386^2 + 2215^2 .

It is a cyclic number.

It is not a de Polignac number, because 6827221 - 2⁵ = 6827189 is a prime.

It is a super-2 number, since 2×6827221² = 93221893165682, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6827221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6827201) 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 in 3 ways as a sum of consecutive naturals, for example, 2746 + ... + 4603.

It is an arithmetic number, because the mean of its divisors is an integer number (1708875).

Almost surely, 2^6827221 is an apocalyptic number.

It is an amenable number.

6827221 is a deficient number, since it is larger than the sum of its proper divisors (8279).

6827221 is an equidigital number, since it uses as much as digits as its factorization.

6827221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8278.

The product of its digits is 2688, while the sum is 28.

The square root of 6827221 is about 2612.8951375821. The cubic root of 6827221 is about 189.7061107477.

The spelling of 6827221 in words is "six million, eight hundred twenty-seven thousand, two hundred twenty-one".