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How much is 13?

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It's about nine-tenths the number of Living Kings and Queens.
In other words, 13 is 0.87 times the count of Living Kings and Queens, and the count of Living Kings and Queens is 1.1 times that amount.
(2015 figures) (distinct Monarchs)
As of 2015, the world has fifteen Kings and Queens reigning over 45 countries. Of all these, Queen Elizabeth the II is the only reigning Queen; she has monarchical authority over the sixteen of the Commonwealth nations.
It's about one-and-two-fifths times the number of Symohonies Composed by Beethoven.
In other words, 13 is 1.44444444444 times the count of Symohonies Composed by Beethoven, and the count of Symohonies Composed by Beethoven is 0.69230769231 times that amount.
(a.k.a. Ludwig van Beethoven)
It's about half the number of Countries in the European Union.
In other words, 13 is 0.46 times the count of Countries in the European Union, and the count of Countries in the European Union is 2.2 times that amount.
(a.k.a. EU) (2016 figures)
It's about three times the number of Living U.S. Presidents.
In other words, the count of Living U.S. Presidents is 0.3 times 13.
(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)
It's about one-fourth the number of Teeth in a Great White Shark's Mouth.
In other words, 13 is 0.27 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 3.7 times that amount.
(Carcharodon carcharias) (average; including developing rows)
It's about one-fourth the number of Countries in Africa.
In other words, 13 is 0.24 times the count of Countries in Africa, and the count of Countries in Africa is 4.2 times that amount.
(2016 figures) (sovereign states recognized by the UN only)
It's about one-fifth the number of Submarines in the US Navy.
In other words, 13 is 0.18 times the count of Submarines in the US Navy, and the count of Submarines in the US Navy is 5.6 times that amount.
(a.k.a. Subs) (includes all types, all classes) (2015 figures)