One hundred one (also One hundred and one) (101, CI) is the natural number following one hundred and preceding one hundred two. It is the 26th prime number and a palindromic number (therefore also a palindromic prime). The next prime is one hundred three, with which it comprises a twin prime. One hundred one is the sum of five consecutive primes (13 + 17 + 19 + 23 + 29)
101 is also:
- The atomic number of mendelevium, an actinide.
- The designation of US Highway 101, which runs from California to Washington.
- In universities, sometimes the course number of basic or entry-level courses. Also used in titles of books to indicate the book is meant for a beginner. At universities with four-digit course numbers, the equivalent course number is 1001 or 1010.
- In the title of the movie 101 Dalmatians, starring Glenn Close.
- A .com URL that redirects to the Disney.go.com website