121111

121111 is a six-digit decimal numeral. In mathematics, it is the natural number that immediately follows 121110 and precedes 121112.

Numerical properties of 121111 can be described in basic terms. It is an odd number, since its last digit is 1. It is not divisible by 2 or 5. The sum of its digits is 7, which implies it is not divisible by 3 or 9. Beyond these simple digit-based tests, no widely cited special mathematical significance is attached to this specific value.

In other contexts, 121111 may be encountered as a code, identifier, or serial string. Such numeric strings are commonly used in inventory systems, dataset labels, file naming conventions, or versioning schemes. Without accompanying documentation, a six-digit code like 121111 typically does not convey meaning beyond its role as an identifier.

Date notation is another context in which the sequence 121111 can appear. When read as a date in the format MMDDYY or DDMMYY, it can represent different dates depending on locale. For example, in the standard US convention (MMDDYY), 12/11/11 would correspond to December 11, 2011; in many other countries (DDMMYY), it would correspond to 12 November 2011. The interpretation depends on regional date-writing practices.

There is no single, universally recognized significance attached to the string 121111 beyond these potential interpretations as a number, date, or identifier. See also: list of integers, date notation, product codes.