What is 17 and 22?

17 is a prime number and the seventh Fermat prime. It is also the sum of the first four prime numbers (2 + 3 + 5 + 7). In Roman numerals, 17 is written as XVII. In the United States, turning 17 years old marks the legal age for driving a car in many states.

22 is an even integer that follows 21 and precedes 23. It is also a composite number, meaning it has at least one divisor other than 1 and itself (22 has divisors 1, 2, 11, and 22). In some cultures, such as in China and Japan, the number 22 is considered auspicious and lucky. In the periodic table, 22 is the atomic number of titanium. Turning 22 years old marks the beginning of one's early twenties.