The number 121 is a perfect square, meaning it is the result of multiplying an integer by itself. Specifically, 121 is the square of 11, as 11 \times 11 = 121. Perfect squares are important in mathematics and are often used in various calculations and problem-solving scenarios. In addition to its mathematical significance, 121 can also be found in other contexts, such as in the United States area codes or as a common reference in education for grade levels. Its properties make it a notable number in both theoretical and practical applications.