ยี่สิบเอ็ด
21
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- 1 21
This is the basic Thai number for 21. It is used for quantities, ages, dates, times, and numbers or labels.
21
It represents the number 21, coming after 20 and before 22.
Learning notes
Explanation
ยี่สิบเอ็ด is the standard Thai numeral for 21. It is formed from ยี่สิบ “twenty” and เอ็ด, the form of “one” normally used at the end of compound numbers such as 11, 21, and 31. When counting objects, the usual order is noun + ยี่สิบเอ็ด + classifier; for example, คนยี่สิบเอ็ดคน means “twenty-one people.” It is also used for ages, calendar dates, clock times, room numbers, and other numerical labels.
Usage
It is commonly used when counting people or objects, stating someone’s age, giving a date or time, and identifying rooms or other numbered items. It appears frequently in shopping, introductions, reservations, and everyday scheduling.
Caution
Do not form 21 as สองสิบเอ็ด. Thai uses the special form ยี่สิบ for 20, making 21 ยี่สิบเอ็ด. Also note that the final digit is normally เอ็ด rather than หนึ่ง in this compound number.