Why 21 is not pronounced as 'onety one'

211 is pronounced as two hundred and eleven but many people spell it as two eleven in short. If eleven gets pronounced as onety one then 211 becomes two onety one in short  which spells as twentyone (21). To remove the confusion onety one is spelled as eleven and so the other numbers between 10 and 20 .

ultrapixel explained

It is a new technology developed by HTC in their latest phone HTC one. HTC took a risk by using this new technology to compete in the market. Instead of using huge megapixel camera, they kept it simple to 4 megapixel. Camera of iphone or nokia uses high megapixel with  of 1.4x1.4 micrometer pixel size whereas HTC increased the pixel size to 2x2 micrometer which is twice the previous pixel size and that is where ultrapixel comes. The size of 4 ultrapixel is equivalent to 8 megapixel but the no. of pixel is equivalent to 4 megapixel. Larger pixel size hepls to attract more light and gives better low light performance.

Though it has less clarity while zooming, it  produces better low light picture and realistic picture. I 'consider the risk as a sucess and unique to interest people.
you can visit the below site to check some sample picture compared with iphone 4s.

We put the HTC One's ultrapixels to the test