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How long is 21 meters?

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It's about one-twentieth as tall as The Empire State Building
In other words, 21 meters is 0.055117 times the height of The Empire State Building, and the height of The Empire State Building is 18.1430 times that amount.
(New York City, New York) (to top of building)
The Empire State Building stands 381.01 m 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 nineteen times as tall as Kenny Baker
In other words, the height of Kenny Baker is 0.053 times 21 meters.
(a.k.a. Kenneth George Baker) (1934-) (actor)
Kenny Baker, most famous for his role as R2-D2 in the Star Wars film franchise, is an LP with a height of 1.1 m. Baker and his wife, Eileen, both made brief appearances as the small, woodland creatures known as Ewoks in the 1984 Star Wars movie, Star Wars: Return of the Jedi (a.k.a. Star Wars Episode VI: Return of the Jedi).
It's about one-twentieth as tall as The Petronas Twin Towers
In other words, 21 meters is 0.04647 times the height of The Petronas Twin Towers, and the height of The Petronas Twin Towers is 21.520 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 451.9 m 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 115 m deep.
It's about twenty times as tall as General Tom Thumb
In other words, the height of General Tom Thumb is 0.043 times 21 meters.
(a.k.a. Charles Sherwood Stratton) (1838-1883) (circus performer; height at death)
General Tom Thumb was an LP with a height (at his death) of 0.91 m. Thumb stopped growing at 0.64 m when he was five years old, but resumed growth in his teens which continued through the remainder of his life.
It's about one-twenty-fifth as tall as The Shanghai World Financial Center
In other words, the height of The Shanghai World Financial Center is 23.40 times 21 meters.
(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 492 m 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 474 m above ground).
It's about one-twenty-fifth as tall as The Willis Tower
In other words, the height of The Willis Tower is 24.80 times 21 meters.
(a.k.a. Sears Tower) (Chicago, Illinois) (to antenna peak)
The Willis Tower rises to about 520 m to the top of its tallest antenna. The bathrooms on the 103rd floor are said to be the highest in the western hemisphere at about 412 m.
It's about one-twenty-fifth as tall as The Ostankino Tower
In other words, the height of The Ostankino Tower is 26 times 21 meters.
(a.k.a. Останкинская телебашня) (Moscow, Russia) (to spire)
The Ostankino Tower stands 540 m 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 500 m.