I was mildly amused by the numbers
I had a good chuckle to myself while looking at my audible account. All three of the numbers have significance to me. The 21 I immediately go right to my time working in a casino and it takes me to blackjack. The 619 is the area code for San Diego so I immediately think of the city. The 17 hits me with two things of significance in that as an ABBA fan its the age of the character in Dancing Queen and also takes me to the roulette table of my casino time as it's the most popular number to bet on as it's allegedly the James Bond number. And I suppose if you took out the zeros on the year my account started, I get a second 21. I was highly amused.