21,465
34 × 5 × 53
Deficient
Odd
Composite
21,465 factors as 3^4 × 5 × 53. Its 20 positive divisors give a proper-divisor sum of 17,739, so this integer is deficient. The Collatz stopping time is 74 steps.
Prime Factor Structure
Factorization String
3^4 × 5 × 53
Distinct Prime Factors
3
Square Status
No
Abundance Measure
Deficient
Analytical Properties
Total Divisors
20
Divisor Sum (σ)
39,204
Proper Divisor Sum
17,739
Digit Sum / Digital Root
18 (Root: 9)
Radix Representation
| Decimal | 21465 |
| Binary | 101001111011001 (15 bits) |
| Octal | 0o51731 |
| Hexadecimal | 0x53D9 |
Divisor Catalog (20)
Collatz Trajectory (74 steps to reach 1)
Iterative sequence n → n/2 (if even) or 3n+1 (if odd):
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