| Hardware and OS Realme Narzo 21 |
| Operating system: | Android v11 |
| Processor: | MediaTek Helio G85 (12nm) |
| RAM: | 4 GB |
| Internal Storage: | 64 GB |
| Display Realme Narzo 21 |
| Type: | IPS LCD |
| Size: | 6.5 inches |
| Resolution: | 720 x 1600 Pixels |
| Pixel Density: | 270 ppi |
| Touchscreen: | Yes, Capacitive Touchscreen, Multi-touch |
| Aspect ratio: | 20:9 |
| Connectivity Realme Narzo 21 |
| Network support: | 4G , 3G, 2G |
| WI-FI: | Yes, Wi-Fi 802.11, b/g/n |
| Gps: | Yes, with A-GPS, Glonass |
| Bluetooth: | Yes, v5.0 |
| NFC: | Yes |
| Dual SIM: | Dual SIM, GSM GSM |
| SIM size: | SIM1: Nano, SIM2: Nano |
| USB connectivity: | Mass storage device, USB charging |
| Camera Realme Narzo 21 |
| Front camera resolution: | 8 MP Primary Camera |
| Camera features: | Digital Zoom, Auto Flash, Face detection, Touch to focus |
| Flash: | Yes, LED Flash |
| Autofocus: | Yes |
| Video recording: | Yes |
| Multimedia Realme Narzo 21 |
| Audio jack: | 3.5 MM |
| Loudspeaker: | Yes |
| Design Realme Narzo 21 |
| Height: | 164.5 mm |
| Width: | 75.9 mm |
| Thickness: | 9.8 mm |
| Weight: | 208 grams |
| Colours: | Glory Silver, Victory Blue |
| Battery Realme Narzo 21 |
| Capacity: | 6000 mAh |
| Type: | Li-Polymer |
| User replaceable: | No |
| Other Realme Narzo 21 |
| Fingerprint sensor: | Yes |
| Fingerprint sensor position: | Rear |
| Other sensors: | Accelerometer, Proximity, Compass |
