21,591,792

2⁴ × 3³ × 151 × 331

Prime Factor Structure

Factorization String 2^4 × 3^3 × 151 × 331

Distinct Prime Factors 4

Square Status No

Abundance Measure Abundant

Total Divisors 80

Divisor Sum (σ) 62,575,360

Proper Divisor Sum 40,983,568

Digit Sum / Digital Root 36 (Root: 9)

Adjacent Primes #21591781 ← → #21591793

1 2 3 4 6 8 9 12 16 18 24 27 36 48 54 72 108 144 151 216 302 331 432 453 604 662 906 993 1,208 1,324 1,359 1,812 1,986 2,416 2,648 2,718 2,979 3,624 3,972 4,077 5,296 5,436 5,958 7,248 7,944 8,154 8,937 10,872 11,916 15,888 16,308 17,874 21,744 23,832 32,616 35,748 47,664 49,981 65,232 71,496

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

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