21,131

11 × 17 × 113

Prime Factor Structure

Factorization String 11 × 17 × 113

Distinct Prime Factors 3

Square Status No

Abundance Measure Deficient

Total Divisors 8

Divisor Sum (σ) 24,624

Proper Divisor Sum 3,493

Digit Sum / Digital Root 8 (Root: 8)

Adjacent Primes #21121 ← → #21139

1 11 17 113 187 1,243 1,921 21,131

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

21,131 63,394 31,697 95,092 47,546 23,773 71,320 35,660 17,830 8,915 26,746 13,373 40,120 20,060 10,030 5,015 15,046 7,523 22,570 11,285 33,856 16,928 8,464 4,232 2,116 1,058 529 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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