How Do You Spell 21 In Words Perfectly Without Mistakes

Spelling of 21 in words

How do you spell 21 in words:
Convert 21 dollars in words (USD):
Twenty-One Dollars
21 spelling in British Pound amount (GBP):
Twenty-One Pounds
How to write 21 Canadian dollars in letters (CAD):
Twenty-One Canadian Dollars

How to write numbers in words similar to 21

Other conversions of the number 21

How to Spell 21

The number 21 is commonly spelled out as ‘twenty-one’. It is a compound number that merges the word ‘twenty’ with ‘one’, indicating a number that comes after twenty but before twenty-two. To spell out ‘twenty-first’, you simply hyphenate ‘twenty’ and ‘one’ and attach ‘first’ to the end to denote its position in a sequence.

Spelling Details and Variations

The ordinal form of 21 is ‘twenty-first’. When writing this form, one must be careful to hyphenate ‘twenty’ and ‘one’, and then add ‘first’ to indicate the ordering sequence such as ’21st’.

When to Spell Out 21 and When to Use the Numeral

It is a general rule to spell out numbers that can be written in one or two words, such as ‘twenty-one’. Use the numeral ’21’ in technical writing, when dealing with precise measurements, statistical data, or when space is limited, such as in tables or graphs.

Practical Examples in Sentences

  • She celebrated her twenty-first birthday last week.
  • There are 21 students in the classroom.
  • The recipe calls for 21 grams of sugar.
  • When I turned 21, I felt a shift towards adulthood.
  • He placed 21st in the marathon.

Special Considerations

In financial contexts, ’21’ is often used numerically to avoid confusion, for example ‘$21.00′. In technical or statistical documents, always use ’21’ to maintain clarity and consistency, especially when related to data sets, measurements, or when referenced in a series.


Understanding how to properly use and spell the number 21 is important in both written and numerical contexts. Whether it’s for formal writing, financial transactions, or technical documents, knowing when to spell out ‘twenty-one’ or use ’21’ is an essential skill.


  1. Express the value of 20 + 1 in words.
  2. If you have 21 apples and you give away 2, how many apples do you have left? Write the answer in words.
  3. How do you write ‘twenty-first century’ in numerals?

Solutions to Exercises

  1. The value of 20 + 1 is ‘twenty-one’.
  2. After giving away 2 apples, you would have nineteen apples left.
  3. The ‘twenty-first century’ is written in numerals as the ’21st century’.

Frequently Asked Questions

How do you spell 21 in words?

The number 21 is spelled ‘twenty-one’.

Is 21 an odd number?

Yes, 21 is an odd number.

What is the ordinal form of 21?

The ordinal form of 21 is ‘twenty-first’.