6721316039 has 2 divisors, whose sum is σ = 6721316040. Its totient is φ = 6721316038.

The previous prime is 6721316023. The next prime is 6721316071. The reversal of 6721316039 is 9306131276.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6721316039 - 2⁴ = 6721316023 is a prime.

It is a super-2 number, since 2×6721316039² = 90352178592237299042, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 6721315993 and 6721316011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6721316839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3360658019 + 3360658020.

It is an arithmetic number, because the mean of its divisors is an integer number (3360658020).

Almost surely, 2^6721316039 is an apocalyptic number.

6721316039 is a deficient number, since it is larger than the sum of its proper divisors (1).

6721316039 is an equidigital number, since it uses as much as digits as its factorization.

6721316039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 38.

The square root of 6721316039 is about 81983.6327506899. The cubic root of 6721316039 is about 1887.2007719681.

The spelling of 6721316039 in words is "six billion, seven hundred twenty-one million, three hundred sixteen thousand, thirty-nine".