8506748021 has 2 divisors, whose sum is σ = 8506748022. Its totient is φ = 8506748020.

The previous prime is 8506748017. The next prime is 8506748087. The reversal of 8506748021 is 1208476058.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6667539025 + 1839208996 = 81655^2 + 42886^2 .

It is a cyclic number.

It is not a de Polignac number, because 8506748021 - 2² = 8506748017 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8506748021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8506748011) 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, 4253374010 + 4253374011.

It is an arithmetic number, because the mean of its divisors is an integer number (4253374011).

Almost surely, 2^8506748021 is an apocalyptic number.

It is an amenable number.

8506748021 is a deficient number, since it is larger than the sum of its proper divisors (1).

8506748021 is an equidigital number, since it uses as much as digits as its factorization.

8506748021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 107520, while the sum is 41.

The square root of 8506748021 is about 92232.0335946248. The cubic root of 8506748021 is about 2041.3674687797.

The spelling of 8506748021 in words is "eight billion, five hundred six million, seven hundred forty-eight thousand, twenty-one".