I found this information on another website about this number.
Phone Number: 2123334567
Owner Name: David Brito
Most Current Address: 333 W 57th St New York, NY 10019
Area: NEW YORK, NY (New York)
Phone Company: VERIZON NEW YORK INC
Switch: NYCMNY50DS2

Received call at 1:01pm on May 15, 2013.  They tell me that my Windows Operating System sent them a message that my computer has a virus.  They demanded that I turn on my computer and allow them to fix it.  They claimed to received permission from Microsoft to do this.  I told them I never gave my phone number to Microsoft.  The website they wanted me to visit was not apart of Microsoft.

There has been other reports of this too.  Microsoft does not do this.  And even owners of Apple Computers receive this call too, even when they don't use Windows for Macs.

CallerID only states:  12123334567

When you answer this there is a lot of talking and then you keep saying hello hello after that I hang up. They call every Sunday for the past month between 9am-9:45am est time.
When I called the # back it states the # 333-4567 in area code 212 in not in service.