Convert 10011 base 2 to a number in base 5

$$10011_2 = (1 \times 2^4) + (0 \times 2^3) + (0 \times 2^2) + (1 \times 2^1) + (1 \times 2^0)$$ $$= (1 \times 16) + (0 \times 8) + (0 \times 4) + (1 \times 2) + (1 \times 1)$$ $$= 16 + 0 + 0 + 2 + 1$$ $$= 19_{10}$$

Divide 19 by 5 and record the remainders.

$$19 \div 5 = 3 \text{ remainder } 4$$ $$3 \div 5 = 0 \text{ remainder } 3$$

Reading the remainders from bottom to top gives the base 5 number.

Therefore, $10011_2$ in base 5 is $\boxed{34_5}$.