21

Summary

21 is a Q16317911^[1]. 21 ranks in the top 7% of positive_integer entities by monthly Wikipedia readership (1,225 views/month).^[2]

Key Facts

• 21's instance of is recorded as Q16317911^[3].
• 21's instance of is recorded as deficient number^[4].
• 21's instance of is recorded as triangular number^[5].
• 21's instance of is recorded as odd number^[6].
• 21's instance of is recorded as centered pentachoric number^[7].
• 21's instance of is recorded as octagonal number^[8].
• 21's instance of is recorded as highly touchable number^[9].
• 21's instance of is recorded as Fibonacci number^[10].
• 21's instance of is recorded as composite number^[11].
• 21's instance of is recorded as harshad number^[12].
• 21 followed 20^[13].
• 21 was followed by 22^[14].
• 21's Commons category is recorded as 21 (number)^[15].
• 21's Unicode character is recorded as ㉑^[16].
• 21's numeric value is recorded as {'amount': '+21'}^[17].
• 21's different from is recorded as 21^[18].
• 21's code is recorded as ௨௰௧^[19].
• 21's code is recorded as ௨௧^[20].
• 21's code is recorded as XXI^[21].
• 21's code is recorded as 𒎙𒐕^[22].
• 21's code is recorded as 10101^[23].
• 21's code is recorded as 25^[24].
• 21's code is recorded as 19^[25].
• 21's code is recorded as 15^[26].
• 21's code is recorded as 210^[27].

Body

Definition and Type

Recorded instance of include Q16317911^[3], deficient number^[4], triangular number^[5], odd number^[6], centered pentachoric number^[7], and octagonal number^[8].

Why It Matters

21 ranks in the top 7% of positive_integer entities by monthly Wikipedia readership (1,225 views/month).^[2] 21 has Wikipedia articles in 30 language editions, a strong signal of global cultural recognition.^[28] 21 is known by 53 alternative names across languages and contexts.^[29]