Size limits on upload to youtube?

I'm trying to upload a 10 minute video to youtube, it is 2.1GB in size.

My account is enabled for uploads longer than 15 minutes so the length is fine.

The limits on my account adjacent to the upload button say:

Videos can be...
High Definition
A wide variety of formats

There is no mention of size limits there.

Before my account was enabled for videos longer than 15 minutes, I had another limitation adjacent to the upload button which said 'videos must be under 2 GB'.

The fact that this was gone made me believe I could now upload videos larger than 2 GB.

I have tried the regular upload page and the Advanced Uploader with no luck so far. The description of the Advanced Uploader tells me: YouTube's Advanced Uploader helps users reliably upload large files to the site (up to 20GB)
So I assumed that meant I was allowed to upload up to 20GB.

After waiting hours for my video to appear, youtube tells me "Uploaded (processing, please wait)" and stays that way for days while the upload process is still showing at around 40%, or it says ' Failed (upload aborted)' though I haven't aborted the upload myself.

I regularly upload videos of over 10 minutes and up to 2 GB in size, so this isn't an internet problem, but this is the first time my upload has been over 2GB.

Is it possible to upload videos larger than 2GB? Or do I need to split my video into two parts. [video cannot me made shorter or smaller in size]