21645

21645 is a natural number following 21644 and preceding 21646. It is an integer. In terms of its prime factorization, 21645 is divisible by 5, as it ends in a 5. Dividing 21645 by 5 yields 4329. Further factorization of 4329 reveals it is divisible by 3, as the sum of its digits (4+3+2+9=18) is divisible by 3. 4329 divided by 3 is 1443. The sum of the digits of 1443 (1+4+4+3=12) is also divisible by 3, so 1443 is divisible by 3. 1443 divided by 3 is 481. The number 481 is a prime number. Therefore, the prime factorization of 21645 is 3 * 3 * 5 * 481, or 3^2 * 5 * 481.

In Roman numerals, 21645 would be represented as XXI DC XLV. The number appears in various contexts, though it does not hold a widely recognized symbolic meaning in mathematics or general culture. Its significance, if any, is usually specific to a particular catalog, index, or dataset where it might serve as an identifier. For example, it could be a product code, a model number, or an entry in a database. Without further context, 21645 is simply one number among an infinite sequence of integers.