Closest hex to #fa21ff is #f2f

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#f2f

fa21ff

fa21ff

contains f2

0f2 1f2 2f2 3f2 4f2 5f2 6f2 7f2 8f2 9f2 af2 bf2 cf2 df2 ef2 f20 f21 f22 f23 f24 f25 f26 f27 f28 f29 f2a f2b f2c f2d f2e f2f ff2

contains 2f

02f 12f 22f 2f0 2f1 2f2 2f3 2f4 2f5 2f6 2f7 2f8 2f9 2fa 2fb 2fc 2fd 2fe 2ff 32f 42f 52f 62f 72f 82f 92f a2f b2f c2f d2f e2f f2f

contains ff

0ff 1ff 2ff 3ff 4ff 5ff 6ff 7ff 8ff 9ff aff bff cff dff eff ff0 ff1 ff2 ff3 ff4 ff5 ff6 ff7 ff8 ff9 ffa ffb ffc ffd ffe fff