5² × 7 × 11²

Prime Factor Structure

Factorization String 5^2 × 7 × 11^2

Distinct Prime Factors 3

Square Status No

Abundance Measure Deficient

Analytical Properties

Total Divisors 18

Divisor Sum (σ) 32,984

Proper Divisor Sum 11,809

Digit Sum / Digital Root 16 (Root: 7)

Adjacent Primes #21169 ← → #21179

1 5 7 11 25 35 55 77 121 175 275 385 605 847 1,925 3,025 4,235 21,175

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

21,175 63,526 31,763 95,290 47,645 142,936 71,468 35,734 17,867 53,602 26,801 80,404 40,202 20,101 60,304 30,152 15,076 7,538 3,769 11,308 5,654 2,827 8,482 4,241 12,724 6,362 3,181 9,544 4,772 2,386 1,193 3,580 1,790 895 2,686 1,343 4,030 2,015 6,046 3,023 9,070 4,535 13,606 6,803 20,410 10,205 30,616 15,308 7,654 3,827 11,482 5,741 17,224 8,612 4,306 2,153 6,460 3,230 1,615 4,846

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