That number comes up on my phone with the cognomen "Texas Call" I never pick it up but since other's try and get a hang up it remains a mystery.  It could be somebody confirming telephone numbers for future data mining and various attempts to telemarket or otherwise extract money.
Given however, the polymorphic versatility of the human gonatrophic vector, it could just as well be somebody sitting forlornly alone on his Father Damian-type cot with his fingers wrapped tightly around his organ of generation.

Obviously a spoofed mumber - There is no such thing as 2140000000

They recently started calling about once per day, no messages.

I'll make this as brief as I can.
I have been receiving calls from this number for about 2 months. If I don't recognize a number, I don't answer the call. The caller never left a message.
I received a call from my accountant today (he has my Power Of Attorney).
He informed me that he had just gotten off the phone with the IRS. They had been trying to contact me to inform me of an audit.
They called my accountant from the same number they had been calling me from.  
214 000-6076.

I wouldn't trust anything over the phone - especially somebody saying it was for an IRS audit.  I would think even the IRS would send correspondence through the US Postal system to inform any individual of this.

Anyway, I just received a call from 214-000-0000 today.

I have received 5 30 second phone calls at work from this number today