"One Hundred Twenty-One" is a numerical value that comes after One Hundred Twenty and before One Hundred Twenty-Two. It is often used in various contexts, such as counting, mathematics, and statistics. In Roman numerals, it is represented as CXXI. In mathematics, One Hundred Twenty-One is an odd number and can be expressed as the product of 11 and 11, making it a perfect square. It is also significant in various cultures and can be found in everyday life, such as in addresses, prices, and measurements.