What is 16 and 19?

16

• General: 16 is the natural number following 15 and preceding 17. It is a composite number, being the square of 4 (4²).
• Mathematics: In mathematics, 16 is a power of two (2⁴). It is used as the base for the <a href="https://www.wikiwhat.page/kavramlar/hexadecimal%20numeral%20system">hexadecimal numeral system</a>. A regular polygon with 16 sides is called a <a href="https://www.wikiwhat.page/kavramlar/hexadecagon">hexadecagon</a>.
• Chemistry: The atomic number of sulfur is 16.
• Computer Science: In computing, 16 bits is a common size for integers and memory addresses.

19

• General: 19 is the natural number following 18 and preceding 20. It is a prime number.
• Mathematics: 19 is the 8th prime number. It is a <a href="https://www.wikiwhat.page/kavramlar/Mersenne%20prime">Mersenne prime</a> exponent (2¹⁹ - 1 is a Mersenne prime).
• Age: In many jurisdictions, 19 is the age of majority, granting legal rights such as voting, purchasing alcohol and tobacco, and entering into contracts.
• Chemistry: Potassium's atomic number is 19.