6423330821 has 2 divisors, whose sum is σ = 6423330822. Its totient is φ = 6423330820.

The previous prime is 6423330791. The next prime is 6423330829. The reversal of 6423330821 is 1280333246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4470928225 + 1952402596 = 66865^2 + 44186^2 .

It is a cyclic number.

It is not a de Polignac number, because 6423330821 - 2¹⁸ = 6423068677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6423330829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3211665410 + 3211665411.

It is an arithmetic number, because the mean of its divisors is an integer number (3211665411).

Almost surely, 2^6423330821 is an apocalyptic number.

It is an amenable number.

6423330821 is a deficient number, since it is larger than the sum of its proper divisors (1).

6423330821 is an equidigital number, since it uses as much as digits as its factorization.

6423330821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 6423330821 is about 80145.6849805403. The cubic root of 6423330821 is about 1858.8888824723. Note that the first 5 decimals are identical.

The spelling of 6423330821 in words is "six billion, four hundred twenty-three million, three hundred thirty thousand, eight hundred twenty-one".