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21 (number)
ID: 21-number
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21 (number)
by
Wikipedia Bot
0
1970-01-01
The
number
21 is an
integer
that comes after 20 and before 22. It is an odd
number
and can be expressed
as
the sum of two
prime numbers
,
10
+ 11, or
as
a
product of the
prime number
3
and
7
(
3
×
7)
.
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articles
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