211121122217 has 2 divisors, whose sum is σ = 211121122218. Its totient is φ = 211121122216.

The previous prime is 211121122187. The next prime is 211121122343. The reversal of 211121122217 is 712221121112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 143346289321 + 67774832896 = 378611^2 + 260336^2 .

It is a cyclic number.

It is not a de Polignac number, because 211121122217 - 2⁸ = 211121121961 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211121122192 and 211121122201.

It is not a weakly prime, because it can be changed into another prime (211121122117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105560561108 + 105560561109.

It is an arithmetic number, because the mean of its divisors is an integer number (105560561109).

Almost surely, 2^211121122217 is an apocalyptic number.

It is an amenable number.

211121122217 is a deficient number, since it is larger than the sum of its proper divisors (1).

211121122217 is an equidigital number, since it uses as much as digits as its factorization.

211121122217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 224, while the sum is 23.

Adding to 211121122217 its reverse (712221121112), we get a palindrome (923342243329).

The spelling of 211121122217 in words is "two hundred eleven billion, one hundred twenty-one million, one hundred twenty-two thousand, two hundred seventeen".