211121200217 has 2 divisors, whose sum is σ = 211121200218. Its totient is φ = 211121200216.

The previous prime is 211121200211. The next prime is 211121200253. The reversal of 211121200217 is 712002121112.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 175007518921 + 36113681296 = 418339^2 + 190036^2 .

It is a cyclic number.

It is not a de Polignac number, because 211121200217 - 2⁶ = 211121200153 is a prime.

It is a super-2 number, since 2×211121200217² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (211121200211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105560600108 + 105560600109.

It is an arithmetic number, because the mean of its divisors is an integer number (105560600109).

Almost surely, 2^211121200217 is an apocalyptic number.

It is an amenable number.

211121200217 is a deficient number, since it is larger than the sum of its proper divisors (1).

211121200217 is an equidigital number, since it uses as much as digits as its factorization.

211121200217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 20.

Adding to 211121200217 its reverse (712002121112), we get a palindrome (923123321329).

The spelling of 211121200217 in words is "two hundred eleven billion, one hundred twenty-one million, two hundred thousand, two hundred seventeen".