8521002001243 has 2 divisors, whose sum is σ = 8521002001244. Its totient is φ = 8521002001242.

The previous prime is 8521002001231. The next prime is 8521002001261. The reversal of 8521002001243 is 3421002001258.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8521002001243 is a prime.

It is not a weakly prime, because it can be changed into another prime (8521002002243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4260501000621 + 4260501000622.

It is an arithmetic number, because the mean of its divisors is an integer number (4260501000622).

Almost surely, 2^{8521002001243} is an apocalyptic number.

8521002001243 is a deficient number, since it is larger than the sum of its proper divisors (1).

8521002001243 is an equidigital number, since it uses as much as digits as its factorization.

8521002001243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3840, while the sum is 28.

The spelling of 8521002001243 in words is "eight trillion, five hundred twenty-one billion, two million, one thousand, two hundred forty-three".