0
21 is a Composite Number.
A Prime number is a whole number that only has two factors which are itself and one. A composite number has factors in addition to one and itself.
21 is divisible by 3 and 7.
Still curious? Ask our experts.
Chat with our AI personalities
DevinI've poured enough drinks to know that people don't always want advice—they just want to talk.
Chat with Devin
RossEvery question is just a happy little opportunity.
Chat with Ross
EzraFaith is not about having all the answers, but learning to ask the right questions.
Chat with EzraMore answers
Add your answer:
Earn +20 ptsQ: Is 21 a prime or composite number?
Write your answer...
Submit
Still have questions?
Continue Learning about Math & Arithmetic
Is number 21 prime or composite?
number 21 is prime
Is the prime number 21 is a prime number?
21 is a composite number, not a prime, having prime factors 3x7.
Why is 21 a prime number?
Who says it is? 21 is a composite number!
Is 21 and 31 a prime number?
21 is composite number that is a multiple of 3. 31 is a prime number.
Is 23 21 19 prime or composite?
19 is a prime number. Its only factors are 1 and 19. 21 is a composite number. Its factors are 1, 3, 7, and 21. 23 is a prime number. Its only factors are 1 and 23.
Trending Questions
What is three-fifths of 20000?
What is scientific and engineering notation?
When will be 10th std CBSE results of 2011 be announced?
What comes before multiplying?
What is an antonym for redundant?
What is greater than 0.8 but less than 0.9?
What is some equivalent fractions to 9 and 16?
How many square feet in city square block?
What numbers are composite between 30 and 50?
What is agle?
How do you check whether the number is unique number?
What geometric shape has 3 lines of symmetry?
How much is two hundred twenty thousand pounds of pure gold worth?
Is best of 5 system in ssc maharashtra board 2011?
How many square meters of a circle with a radius of 1 meters?
How many elements in 8 sets having 6 elements in each?
What is 9 over 50 as a decimal?
What are the first six multiples of 48?
What is the answer to 81 over 3 as a mixed number?
What is a difference between correct and right?
Copyright ©2025 Infospace Holdings LLC, A System1 Company. All Rights Reserved. The material on this site can not be reproduced, distributed, transmitted, cached or otherwise used, except with prior written permission of Answers.