As a number it is: 2,100,000 miles
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Oh, dude, you write 21 million 521 thousand 21 as 21,521,021. It's like counting to a really big number but with commas to make it look fancy. So, just slap those commas in there and you're good to go!
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21,500,000,000,000
The answer is 21 million.
21 miles is exactly 21 miles long or if you prefer 36960 yards long. 21 miles is also 110880 feet long and 1,330,560 inches long.