21

∞ 1.0

The number after twenty and before twenty-two

numeral

: veintiuno

Cardinal Adeyemi, 21 votes.
21 years
April 21
July 21

Examples

The second phase took place 21 months after entry into the longitudinal study.

Academic text (2011)
In the 2018 cycle, about $21 billion.

2000 Mules (2022)
But, when I turned 21, the place became mine.

Blood Hook (1987)
It's been 21 days since we found the house, nothing's happened.

Zero Dark Thirty (2012)
The participants range in age from 21 to 60, with the median age of 28.

Academic text (2011)
After three years in Scotland, Fanny, now 21, grew bored with classical studies and intellectual discussions.

Fiction book (1993)
I'm 21.

Dangerous Curves (1988)
You're under 21.

Lethal Weapon 2 (1989)
The participants' age ranged from 21 to 59 years of age (M = 29.67, SD = 9.57).

Academic text (2011)
The participants range in age from 21 to 60, with the median age of 28.

Synonyms

twenty-one

vs21

74 1.0

A number that comes after twenty

is shown as digits rather than spelled-out words

XXI

vs21

3 4.7

A Roman numeral for twenty-one

is shown as digits rather than as Roman numerals

Compounds

June 21

1 1.0

The day when the sun is farthest north and daylight is longest north of the equator

trisomy 21

Specialized

1 4.6

A condition present at birth caused by an extra 21st chromosome that affects learning and development

atomic number 21

Specialized

7.8

A light white metal called scandium that people use in alloys to make things stronger

June 21

2.3

The day when people worldwide hold public yoga sessions for the International Day of Yoga

Surface Forms

21 cardinal digit

twenty-one cardinal word

twenty one cardinal word

21st ordinal digit

twenty-first ordinal word

twenty first ordinal word

Etymology

The number 21 is read as twenty-one, made from twenty and one. A helpful way to remember it is that twenty means 'two tens' and adding one means 'one more', so 21 is 'two tens and one', the number after twenty.