| Hardware and OS HTC Desire 21 |
| Operating system: | Android v11 |
| Processor: | Qualcomm SM7125 Snapdragon 720G (8 nm |
| RAM: | 8 GB |
| Internal Storage: | 128 GB |
| Display HTC Desire 21 |
| Type: | IPS LCD |
| Size: | 6.5 inches |
| Resolution: | 1080 x 2340 Pixels |
| Pixel Density: | 395 ppi |
| Touchscreen: | Yes, Capacitive Touchscreen, Multi-touch |
| Connectivity HTC Desire 21 |
| Network support: | 4G , 3G, 2G |
| WI-FI: | Yes, Wi-Fi 802.11, a/ac/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 HTC Desire 21 |
| Front camera resolution: | 32 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 HTC Desire 21 |
| Loudspeaker: | Yes |
| Design HTC Desire 21 |
| Height: | 162 mm |
| Width: | 77 mm |
| Thickness: | 9.4 mm |
| Weight: | 201 grams |
| Colours: | Smoky Black, Pretty Blue |
| Battery HTC Desire 21 |
| Capacity: | 5000 mAh |
| Type: | Lithium Polymer |
| Other HTC Desire 21 |
| Fingerprint sensor: | Yes |
| Fingerprint sensor position: | Rear |
| Other sensors: | Accelerometer, Gyro, Proximity, Compass |
