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How long is 21 meters?

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It's about thirty times as tall as Verne Troyer
In other words, the height of Verne Troyer is 0.038 times 21 meters.
(1969-2018) (actor)
Verne Troyer, most famous for his role as Mini-Me in the Austin Powers series, was an LP with a height of 0.81 m. Troyer's first role was as a stunt double for a baby in the 1994 film Baby's Day Out.
It's about one-twenty-fifth as tall as The CN Tower
In other words, 21 meters is 0.037952 times the height of The CN Tower, and the height of The CN Tower is 26.3490 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 553.33 m 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 thirty times as long as a Man's Footstep
In other words, the length of a Man's Footstep is 0.037 times 21 meters.
(for healthy, middle-aged man of average height; single step length)
According to studies by The University of Oklahoma's Health Sciences Center, the average length of a man's step is 0.79 km , for an average stride (two-step's length) of 1.57 m. The average person walks at a speed of about 1.3 m/s
It's about one-thirtieth as tall as a Canton Tower
In other words, the height of a Canton Tower is 29 times 21 meters.
(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 610 m 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 thirty times as long as a Woman's Footstep
In other words, the length of a Woman's Footstep is 0.031 times 21 meters.
(for healthy, middle-aged woman of average height; single step length)
According to studies by The University of Oklahoma's Health Sciences Center, the average length of a woman's step is 0.66 km , for an average stride (two-step's length) of 1.32 m. The average person walks at a speed of about 1.3 m/s
It's about one-thirty-fifth as tall as Gocta Falls
In other words, the height of Gocta Falls is 36.80 times 21 meters.
(a.k.a. Gocta Cataracts, a.k.a. Catarata del Gocta) (Amazonas, Peru) (total height)
Gocta Falls, a waterfall on the Cocahuayco River, measures 771 m in total height. Although it sits just 42,000 meters from the major city of Chachapoyas, the waterfall was unknown to non-locals until it was documented during a 2005 expedition by a German economist.
It's about one-fortieth as tall as Burj Dubai
In other words, 21 meters is 0.0254 times the height of Burj Dubai, and the height of Burj Dubai is 39.40 times that amount.
(formally Burj Khalifa, a.k.a. Dubai Tower, a.k.a. برج خليفة) (Dubai, UAE) (to roof)
Burj Khalifa, the tallest manmade structure in the world, stands 828 m to its roof. The tower also holds the current records for the world's highest Islamic mosque — at approximately 577 m on the 158th floor (of 163 floors) — and the world's tallest outdoor swimming pool — at approximately 285 m on the 78th floor.