| Hardware and OS | Honor X21 | |
| Operating system | Android v10 (Q) | |
| Processor | HiSilicon Kirin 820 5G (7nm) | |
| RAM | 6 GB | |
| Internal Storage | 64 GB | |
| Display | Honor X21 | other phones |
| Type | LTPS IPS LCD | |
| Size | 6.67 inches | |
| Resolution | 1080 x 2400 Pixels | |
| Pixel Density | 397 ppi | |
| Touchscreen | Yes, Capacitive Touchscreen, Multi-touch | |
| Aspect ratio | 20:9 | |
| Connectivity | Honor X21 | other phones |
| Network support | 5G , 4G , 3G, 2G | |
| WI-FI | Yes, Wi-Fi 802.11, b/g/n | |
| Gps | Yes, with A-GPS, Glonass | |
| Bluetooth | Yes, v5.0 | |
| Dual SIM | Dual SIM, GSM GSM | |
| SIM size | SIM1: Nano, SIM2: Nano | |
| USB connectivity | Mass storage device, USB charging | |
| Camera | Honor X21 | other phones |
| Front camera resolution | 16 MP, f/2.0, (wide) | |
| Camera features | Digital Zoom, Auto Flash, Face detection, Touch to focus | |
| Flash | Yes, LED Flash | |
| Autofocus | Yes | |
| Video recording | Yes | |
| Multimedia | Honor X21 | other phones |
| Loudspeaker | Yes | |
| Design | Honor X21 | other phones |
| Height | 163.7 mm | |
| Width | 76.5 mm | |
| Thickness | 8.8 mm | |
| Weight | 203 grams | |
| Colours | Silver, Blue | |
| Battery | Honor X21 | other phones |
| Capacity | 5000 mAh | |
| Type | Li-Polymer | |
| Other | Honor X21 | other phones |
| Fingerprint sensor | Yes | |
| Fingerprint sensor position | Side | |
| Other sensors | Accelerometer, Gyro, Proximity, Compass | |
