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How much is 21,000?

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It's about one-one-hundred-fiftieth the number of ATMs in the World.
In other words, the count of ATMs in the World is 100 times 21,000.
(2015 figures) (approximate)
It's about 150 times the number of Moons in our Solar System.
In other words, 21,000 is 144 times the count of Moons in our Solar System, and the count of Moons in our Solar System is 0.00694 times that amount.
(2015 figures) (confirmed moons only; dwarf planet satellites not included)
It's about 150 times the number of Union Stations in the United States.
In other words, 21,000 is 156 times the count of Union Stations in the United States, and the count of Union Stations in the United States is 0.00641 times that amount.
(a.k.a. Union Terminal; a.k.a. Joint Station; a.k.a. Union Depot) (2016 figures)
Typically shared between multiple railroad companies and stations, there are about 135 "Union Stations" in the United States. Of these, the busiest station is Chicago Union Station, which handles 120,000 passengers each year.
It's about 200 times the number of Elements on the Periodic Table.
In other words, 21,000 is 178 times the count of Elements on the Periodic Table, and the count of Elements on the Periodic Table is 0.00562 times that amount.
(a.k.a. Periodic Table of the Elements, a.k.a chemical elements) (confirmed elements as of 2016)
From element number one, hydrogen, to element one-hundred eighteen, ununoctium, there are 118 confirmed elements on the Periodic Table. Ninety-four of the elements exist in nature, and the remaining twenty-four have only been synthesized in labs (not having occurred naturally in the time since scientists have begun researching them)
It's about 200 times the number of Wolves in Yellowstone National Park.
In other words, 21,000 is 202 times the count of Wolves in Yellowstone National Park, and the count of Wolves in Yellowstone National Park is 0.00495 times that amount.
(a.k.a. Henihco'oo; a.k.a. Héetíhco'oo) (December 2014 figures; Wyoming Park area)
As of the 2014 population count, there were 104 wolves living in Yellowstone National Park, in twelve packs. All of the wolves now living in the Park are thought to have descended from the 66 wolves (re)introduced into the Park in 1995-96.
It's about 250 times the number of Keys on a Piano.
In other words, the count of Keys on a Piano is 0.0042 times 21,000.
(Moden layout; A0 to C7)
Most modern keyboards have 88 keys, comprising seven octaves and an additional major third. A full-size, acoustic piano may have as many as 12,000 separate parts.
It's about 300 times the number of Submarines in the US Navy.
In other words, 21,000 is 290 times the count of Submarines in the US Navy, and the count of Submarines in the US Navy is 0.0034 times that amount.
(a.k.a. Subs) (includes all types, all classes) (2015 figures)