Six of them.
I believe 6
One percent of 1 septillion is 0.01 times 1 septillion. Since 1 septillion is equal to (10^{24}), one percent of it is (0.01 \times 10^{24} = 10^{22}). Therefore, 1 percent of 1 septillion is 10 septillion.
12 septillion pounds
Ten septillions.