realme C21 Specifications

Key Specs General Performance Display Design Rear Camera Front Camera Battery Storage Network & Connectivity Multimedia Sensors

Key Specs
RAM & Storage 3 GB RAM + 32 GB
4 GB RAM + 64 GB
Processor MediaTek Helio G35
Rear Camera 13 MP + 2 MP + 2 MP
Front Camera 5 MP
Battery 5000 mAh
Display 6.5 inches (16.51 cm)

General
Launch Date April 14, 2021 (Official)
Operating System Android v10 (Q)
Custom UI Realme UI

Performance

(Avg)
Chipset MediaTek Helio G35
Processor Octa core, 2.3 GHz, Cortex A53
Architecture 64 bit
Fabrication 12 nm
Graphics (GPU) PowerVR GE8320
RAM 3 GB / 4 GB
RAM Type LPDDR4X
Performance Test Results icon View AnTuTu Score
AnTuTu Score 131,494
Speed Test (Antutu Score)
The higher, the better
Lava Bold N1 5G 516,090 
Lava Storm Play 503,166 
Xiaomi Redmi 14C 438,871 
Tecno Spark Go 5G 418,472 
Acer Mobile Super ZX 413,853 
Tecno Spark Go 3 374,119 
realme C21 131,494 
*Group: 9-12k Phones
See comparison with other phones
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Display

(Very Good)
Display Type IPS LCD
Screen Size 6.5 inches (16.51 cm)
Resolution 720x1600 px (HD+)
Brightness 400 nits
Refresh Rate 60 Hz
Aspect Ratio 20:9
Pixel Density 270 ppi
Screen to Body Ratio (calculated) 80.82 %
Bezel-less Display Yes with waterdrop notch
Screen to Body Ratio (claimed by the brand) 89.5 %

Design
Height 165.2 mm
Width 76.4 mm
Thickness 8.9 mm
Weight 190 grams
Build Material Back: Plastic

Rear Camera

(Good)
Resolution
CameraMPLens FeaturesApertureSensor SizePixel SizeZoomFocal Length
Primary13 MPWide Anglef/2.21/3" 1.12µmupto 4x Digital Zoom26 mm
Secondary2 MPMacrof/2.41.75µm
Tertiary2 MPMonof/2.41.75µm
Autofocus Yes, Phase Detection Autofocus
Flash Yes, LED Flash
Image Resolution 4128 x 3096 Pixels
Settings Exposure compensation, ISO control
Shooting Modes Continuous Shooting
High Dynamic Range mode (HDR)
Camera Features 4 x Digital Zoom
Auto Flash
Face detection
Touch to focus
Video Recording Full HD @30 fps

Front Camera

(Good)
Resolution
CameraMPLens FeaturesApertureSensor SizePixel Size
Primary5 MPWide Anglef/2.21/5.0"1.12µm
Camera Features Fixed Focus
Video Recording Full HD @30 fps

Battery

(Very Good)
Capacity 5000 mAh
Battery Type Li-ion

Storage
Internal Storage 32 GB / 64 GB
Storage Type eMMC 5.1
Expandable Storage Yes, Up to 256 GB

Network & Connectivity
SIM Slot(s) Dual SIM
SIM Type SIM1: Nano, SIM2: Nano
Network Support 5G Not Supported, 4G
VoLTE Yes
SIM 1 4G bands
Expand
Bands Features
4G bandsTD-LTE 2600(band 38) / 2300(band 40) / 2500(band 41)
FD-LTE 2100(band 1) / 1800(band 3) / 2600(band 7) / 900(band 8) / 700(band 28) / 850(band 5) / 800(band 20)
SIM 2 4G bands
Expand
Bands Features
4G bandsTD-LTE 2600(band 38) / 2300(band 40) / 2500(band 41)
FD-LTE 2100(band 1) / 1800(band 3) / 2600(band 7) / 900(band 8) / 700(band 28) / 850(band 5) / 800(band 20)
Wi-Fi Yes, Wi-Fi 4 (802.11 b/g/n), MIMO
Wi-Fi Features Mobile Hotspot
Bluetooth Yes, v5.0
GPS Yes with A-GPS, Glonass
NFC No

Multimedia
Audio Jack 3.5 mm

Sensors
Fingerprint Sensor Yes
Fingerprint Sensor Position Rear
Other Sensors Light sensor, Proximity sensor, Accelerometer
Mobiles› realme C21› realme C21 Specifications
Updated on: June 4, 2026