21000 ft = 3.97727 mile
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There are about 4 miles in 21000 feet.21000 divided by 5280 (5280 is the number of feet in a mile)
1 mile = 5280 ft ⇒ 0.1 mile = 528 ft
5280 feet
26400 ft are in 5 miles. 5280 ft in one mile
Since there are 5,280 feet in a mile, there are 3.97 miles in 21,000 feet.