| Factorisation | 2^5 × 3^2 × 743 |
| Prime | no |
| Binary | 110100001111100000 |
| Hexadecimal | 0x343E0 |
| Bit length | 18 |
| Digit sum | 27 |
| Digits spoken | two one three nine eight four |
213984 opens the sequence 2139847, beginning at digit 1 of seven.
213984 falls below the cardinality of a PubMed record, a Canadian patent application, a European patent application. Those systems assign identifiers sequentially, so it necessarily holds one in each. This is a property of the registries, not of the number. The cardinalities are published here.