Reader Alan Jackson points out that 2021 is the product of consecutive primes: 2021 = 43 × 47.
It’s the first time this has happened since 1763 (= 41 × 43), and it won’t happen again until 2491 (= 47 × 53).
A quick way to find the factors is to note that 2021 is the difference of two squares, 452 – 22, so 2021 = (45 – 2) × (45 + 2).
(Thanks, Alan.)