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How long is 21,000,000 ells?

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It's about 40,000 times as tall as a Canton Tower
In other words, 21,000,000 ells is 39,000 times the height of a Canton Tower, and the height of a Canton Tower is 0.0000260 times that amount.
(a.k.a. Guangzhou TV & Sightseeing Tower, a.k.a. 广 州 电 视 观 光 塔) (Guangzhou, China) (to spire)
The Guangzhou TV & Sightseeing Tower stands 530 ells to its spire. Initially described as holding the record for the tallest Ferris wheel in the world, the ride at the top of the tower is actually an observation carousel; cars complete a trip around the top-floor track about every half-hour.
It's about 45,000 times as tall as The CN Tower
In other words, 21,000,000 ells is 43,379 times the height of The CN Tower, and the height of The CN Tower is 0.0000230530 times that amount.
(a.k.a. La Tour CN, a.k.a. Canadian National Tower, a.k.a. Canada's National Tower) (Toronto, Canada) (to spire)
The CN Tower measures 484.10 ells tall at its spire. Used only in emergencies and for charitable climbing events, the 2,579-step staircase to the top is the longest metal staircase in the world.
It's about 45,000 times as tall as The Ostankino Tower
In other words, the height of The Ostankino Tower is 0.0000230 times 21,000,000 ells.
(a.k.a. Останкинская телебашня) (Moscow, Russia) (to spire)
The Ostankino Tower stands 470 ells to its spire. The tower has been the tallest structure in Europe since its construction in 1967 and was, at at that time, the only free-standing structure taller than 440 ells.
It's about 50,000 times as tall as The Shanghai World Financial Center
In other words, 21,000,000 ells is 48,800 times the height of The Shanghai World Financial Center, and the height of The Shanghai World Financial Center is 0.00002050 times that amount.
(上海环球金融中 上海環球金融中心, Shànghǎi huánqiú jīnróng zhōngxīn) (a.k.a. SWFC) (Shanghai, China) (to spire)
The Shanghai World Financial Center is 430 ells tall to its roof. It is home to both the world's highest hotel (on its 79th through 93rd floors) and the world's tallest observation deck (on its 100th floor, approximately 415 ells above ground).
It's about 55,000 times as tall as The Petronas Twin Towers
In other words, 21,000,000 ells is 53,120 times the height of The Petronas Twin Towers, and the height of The Petronas Twin Towers is 0.000018830 times that amount.
(a.k.a. Menara Berkembar Petronas, a.k.a. Petronas Towers) (Kuala Lumpur, Malaysia) (to spire)
Each of the Petronas Towers stands 395.40 ells to their spires. Holding the record as the tallest buildings in the world from 1998 to 2004, the towers continue to hold the record for the deepest foundation barrettes — up to 100.60 ells deep.
It's about 65,000 times as tall as The Empire State Building
In other words, 21,000,000 ells is 62,998 times the height of The Empire State Building, and the height of The Empire State Building is 0.0000158740 times that amount.
(New York City, New York) (to top of building)
The Empire State Building stands 333.340 ells to its architectural peak. The spire emerging from the top of the building was originally intended to be a mooring mast for blimps whose passengers could disembark onto a landing platform on the 102nd floor of the building.
It's about 75,000 times as tall as The Eiffel Tower
In other words, 21,000,000 ells is 74,100 times the height of The Eiffel Tower, and the height of The Eiffel Tower is 0.00001350 times that amount.
(a.k.a. La Tour Eiffel) (Paris, France) (to flagpole peak)
The Eiffel Tower stands 283 ells tall, including its flagpole. The Tower is the largest structure in Paris as most other buildings are governed by a zoning restriction limiting them to a height of 32.40 ells or less.