DQYDJ uses Fed data to create its various calculators, which I've found to be trustworthy. I'll look for the specific Fed data report later when I have some more time and post it here.

As for the data about the top 1% having a mean of $22M, I'm not surprised by that. Especially in that top percentile, the extreme wealth of the very top 0.1% greatly skews things.

For example, just the top 400 are worth $4.5 trillion! (https://www.forbes.com/forbes-400/). Divide that by 1.5 million and you get a $3M contribution to the mean of the top 1%.