211011217 has 2 divisors, whose sum is σ = 211011218. Its totient is φ = 211011216.

The previous prime is 211011211. The next prime is 211011233. The reversal of 211011217 is 712110112.

It is an a-pointer prime, because the next prime (211011233) can be obtained adding 211011217 to its sum of digits (16).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 162792081 + 48219136 = 12759^2 + 6944^2 .

It is a cyclic number.

It is not a de Polignac number, because 211011217 - 2³ = 211011209 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211011217.

It is not a weakly prime, because it can be changed into another prime (211011211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105505608 + 105505609.

It is an arithmetic number, because the mean of its divisors is an integer number (105505609).

Almost surely, 2^211011217 is an apocalyptic number.

It is an amenable number.

211011217 is a deficient number, since it is larger than the sum of its proper divisors (1).

211011217 is an equidigital number, since it uses as much as digits as its factorization.

211011217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28, while the sum is 16.

The square root of 211011217 is about 14526.2251462656. The cubic root of 211011217 is about 595.3447306744.

Adding to 211011217 its reverse (712110112), we get a palindrome (923121329).

The spelling of 211011217 in words is "two hundred eleven million, eleven thousand, two hundred seventeen".