The number eleven is written 11.
11,011 is how you write eleven thousand eleven
11,011,000,011
12111
Eleven and eleven thousandths.
It is 11,12,111
11,011,011
I would write it as either: eleven point zero zero one or eleven and one thousandth
Eleven quadrillion, eleven trillion, eleven billion, eleven million11,011,011,011,000,000
11,011,111
11,011,111
11,011,111
11,011,011,011