1221.sireads the same both ways
1221

A small corner of the internet for things that come back exactly the way they went out.

hover the number · swap the halves · nothing changes
The number

Why 1221 is a good number to live at

11 × 111 = 1221
Two strings of ones multiply into a palindrome. Repunits are generous like that.
12² = 144  ·  21² = 441
Reverse the halves and their squares reverse too. Very few pairs do this.
12 × 21 = 252
Multiply the halves together and you get another palindrome.
3 × 11 × 37 = 1221
Three primes, and the middle one is a palindrome as well.
Try it

Is it a palindrome?

PALINDROME
Right now

The clock is sometimes a mirror

12:21
Your time
—
Next mirror
—
Arrives in
—
Next date
—
Why .si

Slovenia has a sentence for this

Slovenian children learn it early: a boy named Perica, a duck, and a tail. Read it backwards, letter by letter, and the scene plays out again unchanged.

It seemed right that a palindrome number should live under the Slovenian flag.

Perica reže raci rep.“Perica cuts the duck’s tail.”