6821797812 has 12 divisors (see below), whose sum is σ = 15917528256. Its totient is φ = 2273932600.

The previous prime is 6821797799. The next prime is 6821797837. The reversal of 6821797812 is 2187971286.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 284241564 + ... + 284241587.

It is an arithmetic number, because the mean of its divisors is an integer number (1326460688).

Almost surely, 2^6821797812 is an apocalyptic number.

It is an amenable number.

6821797812 is an abundant number, since it is smaller than the sum of its proper divisors (9095730444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6821797812 is a wasteful number, since it uses less digits than its factorization.

6821797812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 568483158 (or 568483156 counting only the distinct ones).

The product of its digits is 677376, while the sum is 51.

The square root of 6821797812 is about 82594.1754120713. The cubic root of 6821797812 is about 1896.5586656414.

The spelling of 6821797812 in words is "six billion, eight hundred twenty-one million, seven hundred ninety-seven thousand, eight hundred twelve".