about 4 (3.98) miles
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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)
Since there are 5,280 feet in a mile, there are 3.97 miles in 21,000 feet.
4 miles is greater because it has 21120 feet
Answer: 21000 ' = 3.97727 mi. OR 3 mi. and 1720.0 yd
0.15 miles.