8305116821 has 2 divisors, whose sum is σ = 8305116822. Its totient is φ = 8305116820.

The previous prime is 8305116803. The next prime is 8305116857. The reversal of 8305116821 is 1286115038.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4837202500 + 3467914321 = 69550^2 + 58889^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8305116821 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8305116871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4152558410 + 4152558411.

It is an arithmetic number, because the mean of its divisors is an integer number (4152558411).

Almost surely, 2^8305116821 is an apocalyptic number.

It is an amenable number.

8305116821 is a deficient number, since it is larger than the sum of its proper divisors (1).

8305116821 is an equidigital number, since it uses as much as digits as its factorization.

8305116821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 8305116821 is about 91132.4136682443. The cubic root of 8305116821 is about 2025.1098306329.

The spelling of 8305116821 in words is "eight billion, three hundred five million, one hundred sixteen thousand, eight hundred twenty-one".