Closest hex to #d21c02 is #c20

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#c20

d21c02

d21c02

contains c2

0c2 1c2 2c2 3c2 4c2 5c2 6c2 7c2 8c2 9c2 ac2 bc2 c20 c21 c22 c23 c24 c25 c26 c27 c28 c29 c2a c2b c2c c2d c2e c2f cc2 dc2 ec2 fc2

contains 20

020 120 200 201 202 203 204 205 206 207 208 209 20a 20b 20c 20d 20e 20f 220 320 420 520 620 720 820 920 a20 b20 c20 d20 e20 f20

contains c0

0c0 1c0 2c0 3c0 4c0 5c0 6c0 7c0 8c0 9c0 ac0 bc0 c00 c01 c02 c03 c04 c05 c06 c07 c08 c09 c0a c0b c0c c0d c0e c0f cc0 dc0 ec0 fc0