21 and 13 overlap........in the square root of 2..........

square root(2) =

1.41421356237

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Square root of 2 - Wikipedia

https://en.wikipedia.org/wiki/Square_root_of_2

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The square root of 2, or the (1/2)th power of 2, written in mathematics as √2 or 2 ¹⁄₂, is the positive algebraic number that, when multiplied by itself, gives the number 2. Technically, it is called the principal square root of 2, to distinguish it from the negative number with the same property.

Decimal‎: ‎1.4142135623730950488…

Hexadecimal‎: ‎1.6A09E667F3BCC908B2F…