3 × 7 × 19 × 53

Prime Factor Structure

Factorization String 3 × 7 × 19 × 53

Distinct Prime Factors 4

Square Status No

Abundance Measure Deficient

Analytical Properties

Total Divisors 16

Divisor Sum (σ) 34,560

Proper Divisor Sum 13,413

Digit Sum / Digital Root 15 (Root: 6)

Adjacent Primes #21143 ← → #21149

1 3 7 19 21 53 57 133 159 371 399 1,007 1,113 3,021 7,049 21,147

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

21,147 63,442 31,721 95,164 47,582 23,791 71,374 35,687 107,062 53,531 160,594 80,297 240,892 120,446 60,223 180,670 90,335 271,006 135,503 406,510 203,255 609,766 304,883 914,650 457,325 1,371,976 685,988 342,994 171,497 514,492 257,246 128,623 385,870 192,935 578,806 289,403 868,210 434,105 1,302,316 651,158 325,579 976,738 488,369 1,465,108 732,554 366,277 1,098,832 549,416 274,708 137,354 68,677 206,032 103,016 51,508 25,754 12,877 38,632 19,316 9,658 4,829

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