Santos Dumont did not invent the airplane. While Santos Dumont did a lot to help the aviation field with his flight around the Eiffel Tower in the early 1900s, he did not invent the airplane. The Wright Brothers where the inventors of the airplane, and no one should doubt that at all.
Dumont, a Brazilian, invented a motorized dirigible that flew around the Eiffel Tower in 1901. That flight predated the Wright Brothers by two years. But his first fixed-wing flight wasn't until 1906, making the Wright Brothers the first pioneers to achieve motorized flight using wings. Dumont's contributors to aviation are immeasurable, but he specialized in dirigibles first.