It seems that no matter how unrelated two subjects of mathematics appear to be, there are always ways to use techniques from one area of math and use it to prove many useful results in the other, and vice versa. However, from my (inexperienced) point of view, number theory seems to be the only exception to this. That is to say, many mathematicians use techniques from other fields to prove results in number theory, but I very rarely see number-theoretical techniques applied to other fields. I’m not sure if this is due to my unseasoned mathematical knowledge or if the statement has a degree of truth to it. That being said, would it be a good use of my time to study, at the very least, elementary number theory? Or would my efforts be better used to build up my foundations in other areas of mathematics?