7821323999 has 2 divisors, whose sum is σ = 7821324000. Its totient is φ = 7821323998.

The previous prime is 7821323987. The next prime is 7821324053. The reversal of 7821323999 is 9993231287.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7821323999 is a prime.

It is a super-2 number, since 2×7821323999² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 7821323999.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7821323929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3910661999 + 3910662000.

It is an arithmetic number, because the mean of its divisors is an integer number (3910662000).

Almost surely, 2^7821323999 is an apocalyptic number.

7821323999 is a deficient number, since it is larger than the sum of its proper divisors (1).

7821323999 is an equidigital number, since it uses as much as digits as its factorization.

7821323999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1469664, while the sum is 53.

The square root of 7821323999 is about 88438.2496378123. The cubic root of 7821323999 is about 1984.9980858943.

The spelling of 7821323999 in words is "seven billion, eight hundred twenty-one million, three hundred twenty-three thousand, nine hundred ninety-nine".