Any computer, laptop or tablet contain transistors in the form of "die" which are "photo-designed and reduced, masked and etched circuits" of hugely complex and incremental degree, they are not simple. Nobody can tell you except a designer or someone who reads what designers tell you. And no one designer works on an entire (computer) chip. A guess? A 'big' number.
The 113mm^2 chip in the Nexus 7 has about 1.4 billion transistors. The number of transistors in modern microprocessors keeps increasing every day. Intel's 10-core Xeon Westmere-EX. Xilinx currently holds the highest number of transistors, at 6.8 billion.