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How much is 21?

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It's about three-fourths the number of Countries in the European Union.
In other words, the count of Countries in the European Union is 1.30 times 21.
(a.k.a. EU) (2016 figures)
It's about one-and-two-fifths times the number of Living Kings and Queens.
In other words, the count of Living Kings and Queens is 0.710 times 21.
(2015 figures) (distinct Monarchs)
It's about two-fifths the number of Teeth in a Great White Shark's Mouth.
In other words, 21 is 0.440 times the count of Teeth in a Great White Shark's Mouth, and the count of Teeth in a Great White Shark's Mouth is 2.30 times that amount.
(Carcharodon carcharias) (average; including developing rows)
It's about two-and-a-half times the number of Symphonies Composed by Beethoven.
In other words, 21 is 2.333333333330 times the count of Symphonies Composed by Beethoven, and the count of Symphonies Composed by Beethoven is 0.4285714285720 times that amount.
(a.k.a. Ludwig van Beethoven)
It's about two-fifths the number of Countries in Africa.
In other words, 21 is 0.390 times the count of Countries in Africa, and the count of Countries in Africa is 2.60 times that amount.
(2016 figures) (sovereign states recognized by the UN only)
It's about three-tenths the number of Submarines in the US Navy.
In other words, 21 is 0.290 times the count of Submarines in the US Navy, and the count of Submarines in the US Navy is 3.40 times that amount.
(a.k.a. Subs) (includes all types, all classes) (2015 figures)
It's about four times the number of Living U.S. Presidents.
In other words, the count of Living U.S. Presidents is 0.30 times 21.
(a.k.a. Presidents of the United States; a.k.a. Presidents of the United States of America; a.k.a. POTUS), (2016 figures) (including current)