[atlaw]

That “delicate balance” isn't really so delicate, and life isn't really so fragile. Rather, earth's conditions fall within the broad range that is conducive to the resiliently adaptive thing we currently classify as life.

[MHGinTN]

Um, the number refers to the exquisite balance between a universe unihabitable not expanding and unable to sustain atomic structures greater than hydrogen, helium and lithium, and a universe in which stars generate via explosion the heavier elements absolutely necessary to the life we are.

For instance: As a star expels helium atoms, at a precise pressure and temperature these helium atoms unite to form heavier atomic structure. The timing and pressure and temperature are exquisitely crucial to the unverse of our existence. And for the star formations and galaxy structures and planetary systems to exist, the number is a very large improbability, yet we do exist and these interactions do happen and the exquisite balance is maintained!

'Maintained', that is the key you have perhaps missed. [You might enjoy a visit to reasons.org, and reading through a few essays by an astrophysicist who has enumerated these delicacies more fully.]