Category:21 (number)

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2.svg1.svg number: 21 (twenty-one)
instance of: natural number, deficient number, triangular number, odd number, centered pentachoric number, octagonal number, highly touchable number, Fibonacci number and composite number
other integers: 1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 • 16 • 17 • 18 • 19 • 20 • 21 • 22 • 23 • 24 • 25 • 26 • 27 • 28 • 29 • 30 • 31 • 32 • 33 • 34 • 35 • 36 • 37 • 38 • 39 • 40 • 41
-20 • 0 • 10 • 20 • 30 • 40 • 50 • 60 • 70 • 80 • 90 • 100 • 110 • 120 • 130 • 140 • 150 • 160 • 170 • 180 • 190 • 200 • 210 • 220


21 
natural number
Wikipedia
Instance of natural number (22, 20),
deficient number,
triangular number (28, 15),
odd number (23, 19),
centered pentachoric number,
octagonal number,
highly touchable number,
Fibonacci number (34, 13),
composite number
Authority control
Wikidata
Blue pencil.svg

Subcategories

This category has the following 21 subcategories, out of 21 total.

 

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Media in category "21 (number)"

The following 42 files are in this category, out of 42 total.