Ciento veintiuno (sin sustantivo masculino en plural posterior --- with no following plural masculine noun):
¿Cuántos lápices tiene usted? Tengo ciento veintiuno --- How many pencils have you got? I've got 121.)
Ciento veintiún (antes de sustantivo masculino en plural --- before a plural masculine noun):
Aquí tengo ciento veintiún lápices (Here I've got 121 pencils)
Ciento veintidos
Ciento veintiuno (without noun)Ciento veintiún (with a noun either masculine or feminine in plural)
121 = one hundred twenty-one.
121 = 1.21 x 102
121 = one hundred twenty-one.
It is 121/100.
Ciento veintiuno
11 x 11 = 121
The number 121 is "cien veintiuno." (masculine adjective form cien veintiún).
121,000,000
121/4
1.21 = 121/100