“21st” is the proper spelling and form for the number 21 in its ordinal form. The number 1 is an irregular ordinal number and the correct form is “First”. The suffix “-st” follows most numbers that end with 1 – that’s the case with “21st”. “21th” is incorrect and unacceptable.

May 21, 2023 · The correct ordinal form of 21 is '21st.' Use '21st' and other ordinals to show the position, rank, or order of something. If you get caught up on these terms in the future, come back to this guide to review the information.

Jul 13, 2017 · Therefore, the correct form is 21st, and 21th is incorrect. Correct spelling, explanation: 21st is an ordinal number and its full form is spelled twenty-first. It appears between twentieth and twenty-second. When an ordinal number ends with the number one, we add the irregular suffix -st to the number (except for 11, which is spelled 11th).

May 16, 2022 · 21st Correct spelling, explanation: the -st suffix for ordinal numbers is an irregular suffix for number one . This means that 1 and every other number ending with it ( 21 , 541 , 45331 , etc. – with an exception for 11 – 11th ) will have the suffix …

March 21st is the 80th day in the Gregorian calendar; it also marks the anniversary of third—and finally successful—civil rights march led by Dr. Martin Luther King, Jr. and the founding of Twitter. Famous March 21st birthdays include Matthew Broderick, Rosie O'Donnell, and Mark Waid.

the day on which a person reaches the age of 21 and is traditionally said, in Western societies, to become an adult: It's Jamie's twenty-first next Friday . Her dad gave her a car for her twenty-first.

January 21 is the 21st day of the year in the Gregorian calendar; 344 days remain until the end of the year (345 in leap years).

May 21 is the 141st day of the year (142nd in leap years) in the Gregorian calendar; 224 days remain until the end of the year.

Feb 18, 2024 · The answer is simple: “21st” is the correct form. There is no such thing as “21th” – at least, not in standard English usage. The suffix “-st” is used for all ordinal numbers ending in “1”, including “21st”, “31st”, and so on.

Jul 17, 2023 · The major difference between both words is that 21st is correct with respect to rules of ordinal numbers whereas 21th is incorrect. Moreover, The 21st of something is always written as “21st” with a space and the number 21 followed by the letter s.