The answer depends on the units used for 21250: millimetres, inches, feet, metres, miles, light years, ... Since you have not bothered to provide that information, I cannot provide a sensible answer.
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4000 kilometers = 13,123,359.6 feet.
2.5 kilometers = 2,500 meters
5.5 kilometers = 18,044.6194 feet.
30 kilometers = 98,425.1969 feet
5 kilometers=500,000 centimeters