6821313 has 4 divisors (see below), whose sum is σ = 9095088. Its totient is φ = 4547540.

The previous prime is 6821303. The next prime is 6821383. The reversal of 6821313 is 3131286.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6821313 - 2⁵ = 6821281 is a prime.

It is a super-2 number, since 2×6821313² = 93060622087938, which contains 22 as substring.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (6821303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1136883 + ... + 1136888.

It is an arithmetic number, because the mean of its divisors is an integer number (2273772).

Almost surely, 2^6821313 is an apocalyptic number.

It is an amenable number.

6821313 is a deficient number, since it is larger than the sum of its proper divisors (2273775).

6821313 is a wasteful number, since it uses less digits than its factorization.

6821313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2273774.

The product of its digits is 864, while the sum is 24.

The square root of 6821313 is about 2611.7643461844. The cubic root of 6821313 is about 189.6513736323.

Adding to 6821313 its reverse (3131286), we get a palindrome (9952599).

The spelling of 6821313 in words is "six million, eight hundred twenty-one thousand, three hundred thirteen".