21.12000 feet = 0.004 miles
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21,120 feet is four miles.
There are 5,280 feet in a mile. To convert 21,120 feet to miles, you would divide 21,120 by 5,280. This equals 4 miles.
Exactly four miles.
5280 feet = 1 mile so 21120 feet = 21120/5280 = 4 miles.
There are 5280 feet in one mile, so in 4 miles there are 5280 x 4 feet, which is 21120 feet.