8555845021 has 2 divisors, whose sum is σ = 8555845022. Its totient is φ = 8555845020.

The previous prime is 8555844991. The next prime is 8555845033. The reversal of 8555845021 is 1205485558.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7095535225 + 1460309796 = 84235^2 + 38214^2 .

It is a cyclic number.

It is not a de Polignac number, because 8555845021 - 2⁷ = 8555844893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8555845091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4277922510 + 4277922511.

It is an arithmetic number, because the mean of its divisors is an integer number (4277922511).

Almost surely, 2^8555845021 is an apocalyptic number.

It is an amenable number.

8555845021 is a deficient number, since it is larger than the sum of its proper divisors (1).

8555845021 is an equidigital number, since it uses as much as digits as its factorization.

8555845021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 320000, while the sum is 43.

The square root of 8555845021 is about 92497.8108984207. The cubic root of 8555845021 is about 2045.2872125261.

The spelling of 8555845021 in words is "eight billion, five hundred fifty-five million, eight hundred forty-five thousand, twenty-one".