21st Math T-Shirts

Description: Celebrate turning 21 with this 21st birthday math design featuring the square root of 441 equals 21. A clever mathematics and physics concept for STEM students, science lovers, equation fans, and anyone who enjoys nerdy birthday humor. Great for a math themed celebration or a memorable milestone for a number loving birthday person.

Description: Turning 21 with a mathematical twist. This square root of 441 concept is perfect for the student celebrating a milestone.

Description: Level up to 21 with a mathematical twist using the square root of 441. A sophisticated way for college students to celebrate their birthday.

Description: The perfect nerdy 21st birthday gift idea. A great birthday gift idea for geeks, nerds and students.

Description: A complex chalkboard style featuring the square root of 441 to celebrate a 21st birthday with a focus on education.