The number 21 is commonly used in texting and social media as shorthand or slang for various phrases and expressions. “Quit” is the most common definition for 21 on Social Media. Here are some of the most common meanings of “21” in texting and online communication:

- Drinking Age: In the United States, the legal drinking age is 21. As a result, the number 21 is often used to refer to drinking or going to a bar. For example, someone might say “Let’s go out for drinks tonight, I hear that new bar downtown is 21+ only.”
- Blackjack: In the game of blackjack, 21 is the highest possible score a player can achieve. As a result, the number 21 is sometimes used to refer to winning or being successful. For example, someone might say “I aced my math test today, I feel like I just hit 21 at the blackjack table.”
- Birthday: Turning 21 is a significant milestone in many cultures, as it marks the legal age for drinking and is often celebrated as a rite of passage. As a result, the number 21 is often used to refer to birthdays or other celebrations. For example, someone might send a message saying “Happy 21st birthday! Let’s celebrate!”
- Texting Slang: In some online communities, the number 21 is used as a shorthand or slang for various phrases. For example, “21” can mean “too much information” (TMI), “21” can mean “love you” (based on the number of letters in each word), and “21” can mean “crazy” or “insane.”
- Area Code: In some regions of the United States, the number 21 is part of a telephone area code. As a result, it may be used to refer to a specific location or region. For example, someone might say “I’m from the 212, we do things a little differently here.”
- Sporting events: In some sports, such as basketball, the number 21 may hold significance. For example, in street basketball, a game may be played up to 21 points, and in the game of basketball, a player can reach 21 points in a single game.
- Lucky Number: In some cultures, the number 21 is considered a lucky number, and may be associated with good fortune, success, or prosperity. As a result, it may be used as a positive or encouraging message, such as “Keep going, you’re doing great! 21 is your lucky number!”
In conclusion, the meaning of “21” in texting can vary widely depending on the context in which it is used. It could refer to age, drinking, blackjack, milestones, secret codes, slang, police codes, or even a song title.It’s worth noting that the meaning of “21” can vary depending on the context and the individuals involved in the conversation. Therefore, it’s important to be aware of the context and any cultural or regional differences when interpreting text messages or online communication that includes the number 21.