21,397,218

2 × 3 × 107 × 33329

21,397,218 factors as 2 × 3 × 107 × 33329. Its 16 positive divisors give a proper-divisor sum of 21,798,462, so this integer is abundant. The Collatz stopping time is 71 steps.

Prime Factor Structure

Factorization String 2 × 3 × 107 × 33329

Distinct Prime Factors 4

Square Status No

Abundance Measure Abundant

Analytical Properties

Total Divisors 16

Divisor Sum (σ) 43,195,680

Proper Divisor Sum 21,798,462

Digit Sum / Digital Root 33 (Root: 6)

Adjacent Primes #21397217 ← → #21397253

Radix Representation

Decimal	21397218
Binary	1010001100111111011100010 (25 bits)
Octal	0o121477342
Hexadecimal	0x1467EE2

Divisor Catalog (16)

1 2 3 6 107 214 321 642 33,329 66,658 99,987 199,974 3,566,203 7,132,406 10,698,609 21,397,218

Collatz Trajectory (71 steps to reach 1)

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

21,397,218 10,698,609 32,095,828 16,047,914 8,023,957 24,071,872 12,035,936 6,017,968 3,008,984 1,504,492 752,246 376,123 1,128,370 564,185 1,692,556 846,278 423,139 1,269,418 634,709 1,904,128 952,064 476,032 238,016 119,008 59,504 29,752 14,876 7,438 3,719 11,158 5,579 16,738 8,369 25,108 12,554 6,277 18,832 9,416 4,708 2,354 1,177 3,532 1,766 883 2,650 1,325 3,976 1,988 994 497 1,492 746 373 1,120 560 280 140 70 35 106

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