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The number 73 has several fascinating aspects. Mathematically, it is the 21st prime number, and interestingly, its mirror, 37, is the 12th prime number, and their product (73 × 37) equals 2701, which is the exact total of the numbers from 1 to 73. Additionally, 73 is an emirp (a prime that remains prime when its digits are reversed). In binary, 73 is written as 1001001, which is a palindrome, further highlighting its unique properties. Culturally, 73 is famously referenced in the TV show "The Big Bang Theory," where Sheldon Cooper mentions it as his favorite number due to its unique characteristics. In science, 73 is the atomic number of tantalum, a rare and valuable metal used in electronics and surgical implants due to its resistance to corrosion.