206221211115263 has 2 divisors, whose sum is σ = 206221211115264. Its totient is φ = 206221211115262.

The previous prime is 206221211115193. The next prime is 206221211115277. The reversal of 206221211115263 is 362511112122602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 206221211115263 - 2²⁶ = 206221144006399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206221211115163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103110605557631 + 103110605557632.

It is an arithmetic number, because the mean of its divisors is an integer number (103110605557632).

Almost surely, 2^{206221211115263} is an apocalyptic number.

206221211115263 is a deficient number, since it is larger than the sum of its proper divisors (1).

206221211115263 is an equidigital number, since it uses as much as digits as its factorization.

206221211115263 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 35.

Adding to 206221211115263 its reverse (362511112122602), we get a palindrome (568732323237865).

The spelling of 206221211115263 in words is "two hundred six trillion, two hundred twenty-one billion, two hundred eleven million, one hundred fifteen thousand, two hundred sixty-three".