18211880

18211880 is a decimal integer that can be read as a single eight-digit number or, if split, as a pair of year-like segments such as 1821 and 1880. In mathematical contexts it is commonly used as an example of a large composite number and a case study in factorization and divisibility.

Numerical properties: The value is even and ends with zero, so it is divisible by 2, 4, 5, 8, 10 and 40. Its prime factorization is 2^3 × 5 × 19 × 31 × 773, indicating multiple nontrivial divisors. Consequently the number has numerous divisors and is not a prime or a perfect square.

Context and usage: There is no widely recognized historical or scientific entity named exactly 18211880. It appears in mathematics texts as an example to illustrate factorization and divisor counting, and may serve as a placeholder or identifier in datasets, programming examples or numeral puzzles. If interpreted as two dates, the pair 1821 and 1880 points to a 19th-century window, but no specific event is inherently tied to the concatenated form.