8446746821 has 2 divisors, whose sum is σ = 8446746822. Its totient is φ = 8446746820.

The previous prime is 8446746817. The next prime is 8446746823. The reversal of 8446746821 is 1286476448.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5000469796 + 3446277025 = 70714^2 + 58705^2 .

It is a cyclic number.

It is not a de Polignac number, because 8446746821 - 2² = 8446746817 is a prime.

Together with 8446746823, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8446746821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8446746823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4223373410 + 4223373411.

It is an arithmetic number, because the mean of its divisors is an integer number (4223373411).

Almost surely, 2^8446746821 is an apocalyptic number.

It is an amenable number.

8446746821 is a deficient number, since it is larger than the sum of its proper divisors (1).

8446746821 is an equidigital number, since it uses as much as digits as its factorization.

8446746821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2064384, while the sum is 50.

The square root of 8446746821 is about 91906.1848898103. The cubic root of 8446746821 is about 2036.5566367514.

The spelling of 8446746821 in words is "eight billion, four hundred forty-six million, seven hundred forty-six thousand, eight hundred twenty-one".