21K Gas limit is what a regular ETH transaction needs to move ETH from one address to another. Nevertheless, you are moving a token, so there is likely a smart contract that supports it and therefore, due to the code being longer and more complex, it requires a greater limit that the default 21K shown on MEW. For tokens, it is normally recommendable to set the gas limit around the 90-100k area.

As to the gas price, check on https://ethgasstation.info the current network recommended fees (set it based on the gwei shown there, and the if you want a Fast (<2m), Standard (<5m) or SafeLow Tx (<30m)).