Genius
Albert Einstein is perhaps the world’s most famous genius. He was extraordinarily good at math, but in other areas, such as languages, he was not particularly good.  Leonardo da Vinci and Johann Wolfgang von Goethe were geniuses who can also be described as polymaths because they were brilliant in lots of different subjects.  Geniuses are usually child prodigies, i.e., they already show they are a genius when they are young children.