There are an infinite number of numbers between 2.15 m and 2.17 m.
For example, 2.151m, 2.1501m, 2.15001m are all in the given interval. The number of zeros could be increased without limit. Also, they and the final 1 could be replaced by any other digit.
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215 + 216 + 217 + 218 = 866
The numbers are: 215, 217, 219, 221, 223, 225, 227, 229 and 231.
It is 121. That is the difference between 217 and 338, the highest and lowest numbers.
200, 201, 202, 203, 204, 205, 206, 207, 208, 209, 210, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 224, 225, 226, 228, 230
No. 217 is an odd number; 8 is an even number, all multiples of even numbers are even numbers. Thus 217 cannot be a multiple of 8 (or to put it another way: 217 is not divisible by 8).