Hello leftblank15,
iOS v14.2.1 is compatible with the following Platforms:
iPhone
iPhone 6S
iPhone 6S Plus
iPhone SE (1st generation)
iPhone 7
iPhone 7 Plus
iPhone 8
iPhone 8 Plus
iPhone X
iPhone XS
iPhone XS Max
iPhone XR
iPhone 11
iPhone 11 Pro
iPhone 11 Pro Max
iPhone SE (2nd generation)
iPhone 12 Mini
iPhone 12
iPhone 12 Pro
iPhone 12 Pro Max