No, the Samsung Galaxy A21s doesn't support the Samsung Pay option as it doesn't have the NFC feature which is the basic need for operating Samsung Pay Option.
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Check Full Devic Specifications Samsung Galaxy A21s
Samsung Galaxy A21 s comes with a massive 5000 mAh Battery.
To charge this beast, the device comes with 15 W Fast Charging.
In-Hand tests reveal, that the device consumes approximately 2 hr 12 min to charge from 0%-100%.
Also, do not forget to find all the detailed specifications and other latest updates related to Samsung Galaxy A21s here.