Yes, they are.
21The square root of 441 is 21
The square root of 400 is 20, and the square root of 450 is approximately 21.21. Therefore, the square number between 400 and 450 is 441, which is the square of 21.
441 square root
441 has two square roots; 21 or -21.
21
It is 21
21
12
i21 = square root of (-441)
If the reverse square root of the reverse of square of a number is the number itself then it is Adam Number. For ex., 12 and 21 Take 12 square of 12 = 144 reverse of square of 12 = 441 square root of the reverse of square of 12 = 21 The reverse square root of the reverse of square of 12 = 12, then number itself. Such number is called Adam Number. cool....................
length x length = area length = square root of 441= 21 inches