| Hardware and OS | Samsung Galaxy M21 2021 | |
| Operating system | Android 11, One UI 3.1 Core | |
| Processor | Octa-core (4x2.3 GHz Cortex-A73, 4x1.7 GHz Cortex-A53) | |
| GPU | Mali-G72 MP3 | |
| RAM | 4 GB, 6 GB | |
| Internal Storage | 64 GB, 128 GB | |
| Memory Card Slot | microSDXC (dedicated slot) | |
| User Interface | Yes | |
| Display | Samsung Galaxy M21 2021 | other phones |
| Type | Super AMOLED | |
| Size | 6.4 inches | |
| Resolution | 1080 x 2340 pixels | |
| Colors | 16M | |
| Pixel Density | 403 PPI | |
| Touchscreen | Capacitive touchscreen | |
| Protection | Corning Gorilla Glass 3 | |
| Connectivity | Samsung Galaxy M21 2021 | other phones |
| 4G Network | LTE | |
| 5G Network | No | |
| Wi-Fi | Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, hotspot | |
| GPS | Yes, with A-GPS, GLONASS, GALILEO, BDS | |
| NFC | No | |
| USB | USB Type-C 2.0 | |
| Speed | HSPA 42.2/5.76 Mbps, LTE-A | |
| SIM | Nano SIM | |
| Dual SIM | Dual SIM (Nano-SIM, dual stand-by) | |
| Wireless Charging | No | |
| Camera | Samsung Galaxy M21 2021 | other phones |
| Main camera | 48 MP (wide), 8 MP (ultrawide), 5 MP (depth) | |
| Features | LED flash, panorama, HDR | |
| Image | 2160p | |
| Selfie camera | 20 MP (wide) | |
| Multimedia | Samsung Galaxy M21 2021 | other phones |
| Loudspeaker | Yes | |
| Handsfree | Yes | |
| Radio | FM radio, RDS, recording | |
| Video Playback | Yes | |
| Video Out | Yes | |
| Ring Tones | Yes | |
| 3.5 mm Jack | Yes | |
| Design | Samsung Galaxy M21 2021 | other phones |
| Waterproof | No | |
| Battery | Samsung Galaxy M21 2021 | other phones |
| Capacity | Li-Po 6000 mAh, Fast charging 15W | |
| Placement | Non-removable | |
| Other | Samsung Galaxy M21 2021 | other phones |
| Sensors | Fingerprint (rear-mounted), accelerometer, gyro, proximity, compass, | |
