The Realme C21Y smartphone has a 6.50-inch touchscreen display with a resolution of 720×1600 pixels and a 20:9 aspect ratio. The Unisoc T610 processor powers the Realme C21Y. It has 3GB and 4GB of RAM. The Realme C21Y is powered by a 5000mAh battery and runs Android 11. The Realme C21Y is compatible with proprietary fast charging. In terms of cameras, the Realme C21Y has a triple camera setup on the back, with a 13-megapixel (f/2.2) primary camera, a 2-megapixel (f/2.4) camera, and a 2-megapixel (f/2.4) camera. Autofocus is available on the rear camera setup. It has a single front-facing camera with a 5-megapixel sensor and an f/2.4 aperture for selfies.