Assuming you mean 'telephone number':
Eso es mi numero de telefono
"Here is" would be "aquí está".
You spell the number 12 in spanish "doce." You should always spell this number in word form if you plan to use it at the beginning of a sentence, such as "Doce minutos?"
aqui (pr. ah-kee)
Cuarenta
It is "Doscientos"
Ciento dos
The number eleven is spelled 'once' (awn-say) in Spanish.
The number 5200 is cinco mil doscientos.
Treinta y cinco
The number fifteen (15) is quince.quince
The number 270 is "doscientos setenta."
mil seiscientos veintitrés