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How long is 21,000,000 ells?

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It's about 55 times as long as The Grand Canyon
In other words, 21,000,000 ells is 53.80 times the length of The Grand Canyon, and the length of The Grand Canyon is 0.0186 times that amount.
(a.k.a. Gran Cañón) (Arizona) (Colorado River miles measure)
The Grand Canyon has a total length of 390,000 ells along the course of the Colorado River at its bottom. Having opened in early 2007, the Grand Canyon Skywalk allows tourists to stand on a horseshoe-shaped glass walkway 962 ells above the floor of Granite Gorge.
It's about 200 times as long as Hadrian's Wall
In other words, the length of Hadrian's Wall is 0.005 times 21,000,000 ells.
(a.k.a. Roman Wall, a.k.a. The Wall, a.k.a. Vallo di Adriano, a.k.a. Vallum Aelium, a.k.a. Severus' Wall) (from North Tyneside, Tyne and Wear, England, United Kingdom to Cumbria, North West England, United Kingdom)
Hadrian's Wall, which crossed England form the North Sea to the Irish Sea during the time of Roman rule, measures 100,000 ells (about 79 Roman miles). Roman soldiers — at one time up to 10,000 of them — only occupied Great Britain for about 246 years after the wall was built, after which time the local Brits began to take residence the wall's garrisons.
It's about 200 times as long as The 405
In other words, 21,000,000 ells is 205.960 times the length of The 405, and the length of The 405 is 0.0048553 times that amount.
(a.k.a. I-405, Interstate 405, San DIego Freeway) (Southern California)
Running from Irvine to San Fernando, The 405 runs a total of 101,960 ells. The 405 is the most heavily-trafficed freeway in the United States, with an average speed as low as 8 kph during rush hours.
It's about 200 times as long as The English Channel
In other words, 21,000,000 ells is 224 times the length of The English Channel, and the length of The English Channel is 0.00446 times that amount.
(average width between Isle of Ushant and The Walde Lighthouse) (La Manche, Ärmelkanal, Mor Breizh, Mor Bretannek) (a.k.a. The Channel)
The English Channel measures between 93,600 ells, narrowing as it flows northeast. The world speed record for a Channel crossing by swimmer was set by Australian Trent Grimsey in 2012, with a time of 6 hours, 55 minutes.
It's about 250 times as long as The Panama Canal
In other words, the length of The Panama Canal is 0.0037 times 21,000,000 ells.
(Canal de Panamá) (Panama)
Connecting the Atlantic and Pacific Oceans across the Isthmus of Panama, the Canal measures 77,000 ells in length. Ships passing through the Canal are raised (and then lowered) 23 ells above sea level through the lock-and-dam system.
It's about 900 times as tall as Olympus Mons
In other words, 21,000,000 ells is 890 times the height of Olympus Mons, and the height of Olympus Mons is 0.0011 times that amount.
(a.k.a. Mount Olympus) (Mars)
The tallest mountain in the solar system, Olympus Mons rises to approximately 24,000 ells. The mountain has been known to astronomers since the nineteenth century because it is tall enough to rise above Mars' frequent dust storms.
It's about 2,000 times as tall as Maxwell Montes
In other words, 21,000,000 ells is 2,200 times the height of Maxwell Montes, and the height of Maxwell Montes is 0.00045 times that amount.
(Ishtar Terra, Venus)
Maxwell Montes rises to a total height of 9,600 ells. Since Venus does not seem to have the kind of tectonic activity which gives rise to mountains on Earth, the origin of the Venusian mountain remains the subject of some dispute.