A standard high-quality MP3 (320kbps) for a 3-minute song like "Shut Down" usually sits between . A file size of 4.14 MB often indicates one of two things:

Downloading copyrighted material from unauthorized sources can lead to copyright infringement issues depending on your local laws. The Best (and Safest) Ways to Listen

Buy the single on iTunes or Amazon Music to own the high-bitrate file permanently.