6820921039 has 2 divisors, whose sum is σ = 6820921040. Its totient is φ = 6820921038.

The previous prime is 6820921001. The next prime is 6820921061. The reversal of 6820921039 is 9301290286.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6820921039 - 2⁹ = 6820920527 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6820920992 and 6820921010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6820921099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3410460519 + 3410460520.

It is an arithmetic number, because the mean of its divisors is an integer number (3410460520).

Almost surely, 2^6820921039 is an apocalyptic number.

6820921039 is a deficient number, since it is larger than the sum of its proper divisors (1).

6820921039 is an equidigital number, since it uses as much as digits as its factorization.

6820921039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 6820921039 is about 82588.8675246246. The cubic root of 6820921039 is about 1896.4774102929.

The spelling of 6820921039 in words is "six billion, eight hundred twenty million, nine hundred twenty-one thousand, thirty-nine".