21
3 × 7
Deficient
Odd
Composite
Prime Factor Structure
Factorization String
3 × 7
Distinct Prime Factors
2
Square Status
No
Abundance Measure
Deficient
Analytical Properties
Total Divisors
4
Divisor Sum (σ)
32
Proper Divisor Sum
11
Digit Sum / Digital Root
3 (Root: 3)
Radix Representation
| Decimal | 21 |
| Binary | 10101 (5 bits) |
| Octal | 0o25 |
| Hexadecimal | 0x15 |
Divisor Catalog (4)
Collatz Trajectory (7 steps to reach 1)
Iterative sequence n → n/2 (if even) or 3n+1 (if odd):
Active Feeder Network
Other feeder batches with open delivery windows. Each feeder keeps its own target batch.