Semi-Magic Squares of Order 21 With Digits 2 and 1
Above two magic square are semi-magic squares with locks of orders 3 and 7. The semi-magic sums of semi-magic squares is 35555555552. Instead of semi-magic we can construct magic square also, but in this it will be without blocks.
Morever, the above magic squares are upside-down. They are mirror-looking too, but in this case 2 become 5, i.e., it is no more with 2 and 1. It will be with 5 and 1.