21,742

2 × 7 × 1553

Prime Factor Structure

Factorization String 2 × 7 × 1553

Distinct Prime Factors 3

Square Status No

Abundance Measure Deficient

Total Divisors 8

Divisor Sum (σ) 37,296

Proper Divisor Sum 15,554

Digit Sum / Digital Root 16 (Root: 7)

Adjacent Primes #21739 ← → #21751

1 2 7 14 1,553 3,106 10,871 21,742

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

21,742 10,871 32,614 16,307 48,922 24,461 73,384 36,692 18,346 9,173 27,520 13,760 6,880 3,440 1,720 860 430 215 646 323 970 485 1,456 728 364 182 91 274 137 412 206 103 310 155 466 233 700 350 175 526 263 790 395 1,186 593 1,780 890 445 1,336 668 334 167 502 251 754 377 1,132 566 283 850

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