6821200128 has 36 divisors (see below), whose sum is σ = 18154341968. Its totient is φ = 2273733120.

The previous prime is 6821200109. The next prime is 6821200129. The reversal of 6821200128 is 8210021286.

It is a junction number, because it is equal to n+sod(n) for n = 6821200095 and 6821200104.

It is not an unprimeable number, because it can be changed into a prime (6821200129) 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, 4440118 + ... + 4441653.

Almost surely, 2^6821200128 is an apocalyptic number.

It is an amenable number.

6821200128 is an abundant number, since it is smaller than the sum of its proper divisors (11333141840).

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

6821200128 is an equidigital number, since it uses as much as digits as its factorization.

6821200128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8881790 (or 8881776 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 6821200128 is about 82590.5571357888. The cubic root of 6821200128 is about 1896.5032757522.

The spelling of 6821200128 in words is "six billion, eight hundred twenty-one million, two hundred thousand, one hundred twenty-eight".