RSA - How to change the encrypted numerical result into text? I'm aware of the way that the original plain text is converted into a number by taking the ascii numbers of the byte array of the plain text, but doing things the other way around doesn't seem to work. 

The encrypted message is pretty much a series of random digits(let's say it's in hexadecimal), which means that some of it will go above the 7F, or 127, limit of ascii. What happens then?

Edit: Ah, my error was that I somehow forgot that ascii was just 7 bits. Anyway, it was useful seeing how the ciphertext can be represented in different ways.
You don't encode the encrypted result of an RSA encryption to text; it's just a sequence of bytes. It makes no sense as "text". In network traffic such bytes can often just be sent as is, but if you're in a text based protocol (mail , HTTP etc.) one could encode the RSA-bytes from the encryption as base64 encoded data, and this is sometimes done. In either case it's not meant for "human consumption", but used in a program. RSA is not a hand cipher...