Closest hex to #212e71 is #237

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#
#237

212e71

212e71

contains 23

023 123 223 230 231 232 233 234 235 236 237 238 239 23a 23b 23c 23d 23e 23f 323 423 523 623 723 823 923 a23 b23 c23 d23 e23 f23

contains 37

037 137 237 337 370 371 372 373 374 375 376 377 378 379 37a 37b 37c 37d 37e 37f 437 537 637 737 837 937 a37 b37 c37 d37 e37 f37

contains 27

027 127 227 270 271 272 273 274 275 276 277 278 279 27a 27b 27c 27d 27e 27f 327 427 527 627 727 827 927 a27 b27 c27 d27 e27 f27