6821020339 has 8 divisors (see below), whose sum is σ = 7905247488. Its totient is φ = 5764242120.

The previous prime is 6821020319. The next prime is 6821020373. The reversal of 6821020339 is 9330201286.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6821020339 - 2²⁹ = 6284149427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6821020319) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6861697 + ... + 6862690.

It is an arithmetic number, because the mean of its divisors is an integer number (988155936).

Almost surely, 2^6821020339 is an apocalyptic number.

6821020339 is a deficient number, since it is larger than the sum of its proper divisors (1084227149).

6821020339 is a wasteful number, since it uses less digits than its factorization.

6821020339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13724465.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 6821020339 is about 82589.4686930483. The cubic root of 6821020339 is about 1896.4866133166.

The spelling of 6821020339 in words is "six billion, eight hundred twenty-one million, twenty thousand, three hundred thirty-nine".