21,027,436

2² × 17 × 29 × 10663

Prime Factor Structure

Factorization String 2^2 × 17 × 29 × 10663

Distinct Prime Factors 4

Square Status No

Abundance Measure Deficient

Total Divisors 24

Divisor Sum (σ) 40,309,920

Proper Divisor Sum 19,282,484

Digit Sum / Digital Root 25 (Root: 7)

Adjacent Primes #21027421 ← → #21027443

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

21,027,436 10,513,718 5,256,859 15,770,578 7,885,289 23,655,868 11,827,934 5,913,967 17,741,902 8,870,951 26,612,854 13,306,427 39,919,282 19,959,641 59,878,924 29,939,462 14,969,731 44,909,194 22,454,597 67,363,792 33,681,896 16,840,948 8,420,474 4,210,237 12,630,712 6,315,356 3,157,678 1,578,839 4,736,518 2,368,259 7,104,778 3,552,389 10,657,168 5,328,584 2,664,292 1,332,146 666,073 1,998,220 999,110 499,555 1,498,666 749,333 2,248,000 1,124,000 562,000 281,000 140,500 70,250 35,125 105,376 52,688 26,344 13,172 6,586 3,293 9,880 4,940 2,470 1,235 3,706

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