13 × 1621

Prime Factor Structure

Factorization String 13 × 1621

Distinct Prime Factors 2

Square Status No

Abundance Measure Deficient

Analytical Properties

Total Divisors 4

Divisor Sum (σ) 22,708

Proper Divisor Sum 1,635

Digit Sum / Digital Root 13 (Root: 4)

Adjacent Primes #21067 ← → #21089

1 13 1,621 21,073

Iterative sequence n → n/2 (if even) or 3n+1 (if odd):

21,073 63,220 31,610 15,805 47,416 23,708 11,854 5,927 17,782 8,891 26,674 13,337 40,012 20,006 10,003 30,010 15,005 45,016 22,508 11,254 5,627 16,882 8,441 25,324 12,662 6,331 18,994 9,497 28,492 14,246 7,123 21,370 10,685 32,056 16,028 8,014 4,007 12,022 6,011 18,034 9,017 27,052 13,526 6,763 20,290 10,145 30,436 15,218 7,609 22,828 11,414 5,707 17,122 8,561 25,684 12,842 6,421 19,264 9,632 4,816

Other feeder batches with open delivery windows. Each feeder keeps its own target batch.