3² × 5 × 7 × 67

Prime Factor Structure

Factorization String 3^2 × 5 × 7 × 67

Distinct Prime Factors 4

Square Status No

Abundance Measure Abundant

Analytical Properties

Total Divisors 24

Divisor Sum (σ) 42,432

Proper Divisor Sum 21,327

Digit Sum / Digital Root 9 (Root: 9)

Adjacent Primes #21101 ← → #21107

Radix Representation

Decimal	21105
Binary	101001001110001 (15 bits)
Octal	0o51161
Hexadecimal	0x5271

Divisor Catalog (24)

1 3 5 7 9 15 21 35 45 63 67 105 201 315 335 469 603 1,005 1,407 2,345 3,015 4,221 7,035 21,105

Collatz Trajectory (56 steps to reach 1)

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

21,105 63,316 31,658 15,829 47,488 23,744 11,872 5,936 2,968 1,484 742 371 1,114 557 1,672 836 418 209 628 314 157 472 236 118 59 178 89 268 134 67 202 101 304 152 76 38 19 58 29 88 44 22 11 34 17 52 26 13 40 20 10 5 16 8 4 2 1

Active Feeder Network

Other feeder batches with open delivery windows. Each feeder keeps its own target batch.

Feeder #7,737,779 Feeder #685,881 Feeder #2,871,188 Feeder #906,051 Feeder #1,285,993 Feeder #7,584,379 Feeder #4,761,186 Feeder #626,174

← Previous Integer #21,104 Browse Full Index Next Integer #21,106 →