121 is an interesting number. It’s triangular and square and cubic,, and both it and its square root contain the same digits. It’s also a prime plus a prime plus a prime. And it’s 1 cubed plus two cubed plus three cubed plus four cubed.
It also happens to be the temperature in Celsius that results in a perfect “to-the-tooth” caramel, which we covered in Bolivian very dark chocolate and touched with red salt from Hawaii.