EN · English · Base 10
21
integer · decimal
twenty-one
British English
twenty-one
Ordinal
twenty-first
How to Write 21 in Words
Integer · English · Base 10
Usage Examples
Bank Check
Pay to the order of ___________________
Twenty-one and 00/100 and 00/100
DOLLARS $21.00
Legal Document
"The total amount of Twenty-one (21) shall be payable within thirty (30) days of the invoice date."
Invoice / Receipt
Total Due: $21. Amount in words: Twenty-one Dollars
In Currencies
$
US Dollar (USD)
twenty-one dollars
€
Euro (EUR)
twenty-one euros
£
British Pound (GBP)
twenty-one pounds
₹
Indian Rupee (INR)
twenty-one rupees
C$
Canadian Dollar (CAD)
twenty-one Canadian dollars
A$
Australian Dollar (AUD)
twenty-one Australian dollars
Fr.
Swiss Franc (CHF)
twenty-one Swiss francs
¥
Japanese Yen (JPY)
twenty-one yens
In 8 Languages
Frequently Asked
What is 21 in words?
21 in words is "twenty-one".
How do you write 21 on a check?
On a check, write "Twenty-one and 00/100 Dollars" on the amount line. Draw a line to prevent alteration.
Is 21 a prime number?
No, 21 is not a prime number — it is composite.
What is 21 in binary?
21 in binary is 10101.