21,138

2 × 3 × 13 × 271

Prime Factor Structure

Factorization String 2 × 3 × 13 × 271

Distinct Prime Factors 4

Square Status No

Abundance Measure Abundant

Total Divisors 16

Divisor Sum (σ) 45,696

Proper Divisor Sum 24,558

Digit Sum / Digital Root 15 (Root: 6)

Adjacent Primes #21121 ← → #21139

1 2 3 6 13 26 39 78 271 542 813 1,626 3,523 7,046 10,569 21,138

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

21,138 10,569 31,708 15,854 7,927 23,782 11,891 35,674 17,837 53,512 26,756 13,378 6,689 20,068 10,034 5,017 15,052 7,526 3,763 11,290 5,645 16,936 8,468 4,234 2,117 6,352 3,176 1,588 794 397 1,192 596 298 149 448 224 112 56 28 14 7 22 11 34 17 52 26 13 40 20 10 5 16 8 4 2 1

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