Also: 2,143 (two thousand one hundred forty-three) is an odd four-digits prime number following 2142 and preceding 2144. In scientific notation, it is written as 2.143 × 103. The sum of its digits is 10. It has a total of 1 prime factor and 2 positive divisors. There are 2,142 positive integers (up to 2143) that are relatively prime to 2143.