6721420439 has 2 divisors, whose sum is σ = 6721420440. Its totient is φ = 6721420438.

The previous prime is 6721420421. The next prime is 6721420483. The reversal of 6721420439 is 9340241276.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6721420439 - 2²⁸ = 6452984983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6721480439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3360710219 + 3360710220.

It is an arithmetic number, because the mean of its divisors is an integer number (3360710220).

Almost surely, 2^6721420439 is an apocalyptic number.

6721420439 is a deficient number, since it is larger than the sum of its proper divisors (1).

6721420439 is an equidigital number, since it uses as much as digits as its factorization.

6721420439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 6721420439 is about 81984.2694606715. The cubic root of 6721420439 is about 1887.2105430080.

The spelling of 6721420439 in words is "six billion, seven hundred twenty-one million, four hundred twenty thousand, four hundred thirty-nine".