220021

220021 is a six-digit natural number that can function as a numeric identifier in various contexts. As a plain integer, it is odd, with a digit sum of 7, and it is not divisible by 2, 3, or 5. Its primality is not established in a brief summary, since full factorization is required to confirm whether it is prime or composite; without a known factorization, it remains one of many six-digit integers without widely noted arithmetic significance.

In practical use, sequences of six digits are commonly employed as postal codes, product or catalog numbers, or other identifiers. A code like 220021 could be assigned by a regional postal system, an inventory database, a library or archival catalog, or a manufacturing or logistics registry. The exact meaning and the geographic or organizational scope of the code depend on the issuing authority and the context in which it appears.

As a generic reference value, 220021 can also appear in data sets, software systems, or archival records where a six-digit code is required. In such cases, its interpretation is entirely context-dependent and relies on accompanying metadata to clarify its intended reference.

See also: related numbers such as 220020 and 220022, and broader discussions of six-digit identifiers used in postal, inventory, and archival contexts.