10206705521 has 2 divisors, whose sum is σ = 10206705522. Its totient is φ = 10206705520.

The previous prime is 10206705503. The next prime is 10206705529. The reversal of 10206705521 is 12550760201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10142705521 + 64000000 = 100711^2 + 8000^2 .

It is a cyclic number.

It is not a de Polignac number, because 10206705521 - 2²⁶ = 10139596657 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (10206705529) 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, 5103352760 + 5103352761.

It is an arithmetic number, because the mean of its divisors is an integer number (5103352761).

Almost surely, 2^10206705521 is an apocalyptic number.

It is an amenable number.

10206705521 is a deficient number, since it is larger than the sum of its proper divisors (1).

10206705521 is an equidigital number, since it uses as much as digits as its factorization.

10206705521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4200, while the sum is 29.

The spelling of 10206705521 in words is "ten billion, two hundred six million, seven hundred five thousand, five hundred twenty-one".