The best replacement for a21 is a19.

The best alternatives to a21 are rated as following:
★★★★★  a19
★★★★★  a110
★★★★  a9+
★★★  a30
★★  a90s
★★  a111
★★  a100
★★  a23
★★  micromax a110
★★  a27
★★  a18
★  micromax a90s
★  micromax a100
★  a24
★  a12
  xolo a700
  a11
  emotiva xpa 2
  a31
  a19 bulb
  840w
  a26
  e27

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a21
a19
a110