2×105

2×105 is the product of the integers 2 and 105, yielding 210. The expression is a straightforward example of multiplication in base-10 arithmetic. The resulting number, 210, can be represented in several common notations: in decimal as 210; in binary as 11010010; in scientific notation as 2.1 × 10^2; in Roman numerals as CCX; and in factorized form as 2 × 3 × 5 × 7.

210 is an even, composite number. Its prime factorization shows that it has 16 positive divisors. It can also be expressed as a product of two consecutive integers, 14 × 15, and as a binomial coefficient, C(10,4) = 210, which equals C(10,6). In combinatorial and arithmetic contexts, 210 also appears as the 20th triangular number, since the sum of the integers from 1 to 20 is 210 (20 × 21 / 2).

In practical terms, 210 serves as a common example in elementary mathematics for illustrating multiplication, factorization, and various representations of the same number. Its multiple representations and relations to other well-known numbers make it a convenient reference point in teaching and problem-solving.