2111111111

2111111111 is a decimal natural number. In standard notation it is written as 2,111,111,111. The digits form a 2 followed by nine 1s, giving it a distinctive pattern in base 10.

Mathematically, the number is odd, since its last digit is 1, and the sum of its digits is 11, so it is not divisible by 3 or 9. It can be expressed in place-value form as 2×10^9 + 111,111,111, and in scientific notation it is approximately 2.111111111 × 10^9. It lies between 2.0 × 10^9 and 3.0 × 10^9 on the number line.

In computing contexts, 2,111,111,111 fits within the range of 32-bit signed integers (−2,147,483,648 to 2,147,483,647). This makes it suitable for everyday integer arithmetic in many programming environments.

Contexts and significance: there is no widely recognized mathematical constant associated with this exact value, and it is not known for a unique factorization pattern beyond ordinary arithmetic. It sometimes appears as an illustrative or test value in examples and datasets because of its simple digit structure (a leading 2 followed by multiple 1s). As a numeric label, it can also occur in identifiers or sample sequences that favor uniform digit patterns.