206221211115193 has 2 divisors, whose sum is σ = 206221211115194. Its totient is φ = 206221211115192.

The previous prime is 206221211115191. The next prime is 206221211115263. The reversal of 206221211115193 is 391511112122602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 171879231913984 + 34341979201209 = 13110272^2 + 5860203^2 .

It is a cyclic number.

It is not a de Polignac number, because 206221211115193 - 2¹ = 206221211115191 is a prime.

Together with 206221211115191, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (206221211115191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103110605557596 + 103110605557597.

It is an arithmetic number, because the mean of its divisors is an integer number (103110605557597).

Almost surely, 2^{206221211115193} is an apocalyptic number.

It is an amenable number.

206221211115193 is a deficient number, since it is larger than the sum of its proper divisors (1).

206221211115193 is an equidigital number, since it uses as much as digits as its factorization.

206221211115193 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 37.

Adding to 206221211115193 its reverse (391511112122602), we get a palindrome (597732323237795).

The spelling of 206221211115193 in words is "two hundred six trillion, two hundred twenty-one billion, two hundred eleven million, one hundred fifteen thousand, one hundred ninety-three".