221210112217 has 2 divisors, whose sum is σ = 221210112218. Its totient is φ = 221210112216.

The previous prime is 221210112199. The next prime is 221210112247. The reversal of 221210112217 is 712211012122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 221183030601 + 27081616 = 470301^2 + 5204^2 .

It is a cyclic number.

It is not a de Polignac number, because 221210112217 - 2⁷ = 221210112089 is a prime.

It is not a weakly prime, because it can be changed into another prime (221210112247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110605056108 + 110605056109.

It is an arithmetic number, because the mean of its divisors is an integer number (110605056109).

Almost surely, 2^221210112217 is an apocalyptic number.

It is an amenable number.

221210112217 is a deficient number, since it is larger than the sum of its proper divisors (1).

221210112217 is an equidigital number, since it uses as much as digits as its factorization.

221210112217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 224, while the sum is 22.

Adding to 221210112217 its reverse (712211012122), we get a palindrome (933421124339).

The spelling of 221210112217 in words is "two hundred twenty-one billion, two hundred ten million, one hundred twelve thousand, two hundred seventeen".