Convert decimal 21 to binary, octal, hexadecimal

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Convert 21 from decimal How to convert number 21 from decimal to binary, octal, hexadecimal?
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Zecimal number

conversion rule

10101

conversion rule

25

21 to hexadecimal

conversion rule

15

Decimal to Binary

Convert number decimal 21₁₀ to binary:
21₁₀ = 10101₂

Divided by 2	Quotient	Remainder	Bit #
21/2	10	1	0
10/2	5	0	1
5/2	2	1	2
2/2	1	0	3
1/2	0	1	4

Decimal to Octal

Convert 21₁₀ to octal:
21₁₀ = 25₈

Divided by 8	Quotient	Remainder	Bit #
21/8	2	5	0
2/8	0	2	1

Decimal to Hexadecimal

Convert 21₁₀ to hexadecimal:
21₁₀ = 15₁₆

Divided by 8	Quotient	Remainder (decimal)	Remainder (hexa)	Bit #
21/16	1	5	5	0
1/16	0	1	1	1

Convert other numbers:

16 17 18 19 20 21 22 23 24 25 26

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