##### Asked by: Aiden Carvalheira

asked in category: General Last Updated: 25th March, 2020# What's the 21st prime number?

Accordingly, is 73 the perfect number?

Answer and Explanation: The **number 73** is not a **perfect number**, but the **number** does have some odd qualities that make it unique. First, **73** is the 21st prime **number**.

Likewise, what is the number 73 in binary code? DECIMAL NUMBERS IN BINARY

0 | 0 |
---|---|

72 | 1001000 |

73 | 1001001 |

74 | 1001010 |

75 | 1001011 |

Simply so, what does Sheldon's 73 T shirt mean?

**Sheldon** Cooper's **73 Shirt**. The **73** reference is from Season 4, Episode 10 (The Alien Parasite Hypothesis), when **Sheldon** says “The best number is **73**…. **73** is the twenty-first prime number. Its mirror, 37, is the twelfth and its mirror, 21, is the product of multiplying (hang on **to** your hats) 7 and 3….

Why is 73 a prime number?

For **73**, the answer is: yes, **73** is a **prime number** because it has only two distinct divisors: 1 and itself (**73**). As a consequence, **73** is only a multiple of 1 and **73**.