Their GCF is 1.
The factors of 121 are 1, 11, and 121.
The factors of 999 are 1, 3, 9, 27, 37, 111, 333, and 999.
The only common factor, and thus the greatest common factor, is 1.
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Basically every "counting number" between 100 and 999 like 101, for example.
there are many symmetric numbers. 111, 121, 454, 252, 999, 545 etc
1.0 × 10^56
999 infinitie 999 googleplex 999 nonnillion 999 octillion 999 sextillion 999 trillion 999 billion 999 million 999 thousand 999...
999 quadrillion, 999 trillion, and 1 billion.