21,396,876

2² × 3 × 1783073

21,396,876 factors as 2^2 × 3 × 1783073. Its 12 positive divisors give a proper-divisor sum of 28,529,196, so this integer is abundant. The Collatz stopping time is 71 steps.

Prime Factor Structure

Factorization String 2^2 × 3 × 1783073

Distinct Prime Factors 3

Square Status No

Abundance Measure Abundant

Analytical Properties

Total Divisors 12

Divisor Sum (σ) 49,926,072

Proper Divisor Sum 28,529,196

Digit Sum / Digital Root 42 (Root: 6)

Adjacent Primes #21396871 ← → #21396883

Radix Representation

Decimal	21396876
Binary	1010001100111110110001100 (25 bits)
Octal	0o121476614
Hexadecimal	0x1467D8C

Divisor Catalog (12)

1 2 3 4 6 12 1,783,073 3,566,146 5,349,219 7,132,292 10,698,438 21,396,876

Collatz Trajectory (71 steps to reach 1)

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

21,396,876 10,698,438 5,349,219 16,047,658 8,023,829 24,071,488 12,035,744 6,017,872 3,008,936 1,504,468 752,234 376,117 1,128,352 564,176 282,088 141,044 70,522 35,261 105,784 52,892 26,446 13,223 39,670 19,835 59,506 29,753 89,260 44,630 22,315 66,946 33,473 100,420 50,210 25,105 75,316 37,658 18,829 56,488 28,244 14,122 7,061 21,184 10,592 5,296 2,648 1,324 662 331 994 497 1,492 746 373 1,120 560 280 140 70 35 106

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