21,390,615

3³ × 5 × 158449

21,390,615 factors as 3^3 × 5 × 158449. Its 16 positive divisors give a proper-divisor sum of 16,637,385, so this integer is deficient. The Collatz stopping time is 190 steps.

Prime Factor Structure

Factorization String 3^3 × 5 × 158449

Distinct Prime Factors 3

Square Status No

Abundance Measure Deficient

Analytical Properties

Total Divisors 16

Divisor Sum (σ) 38,028,000

Proper Divisor Sum 16,637,385

Digit Sum / Digital Root 27 (Root: 9)

Adjacent Primes #21390613 ← → #21390617

Radix Representation

Decimal	21390615
Binary	1010001100110010100010111 (25 bits)
Octal	0o121462427
Hexadecimal	0x1466517

Divisor Catalog (16)

1 3 5 9 15 27 45 135 158,449 475,347 792,245 1,426,041 2,376,735 4,278,123 7,130,205 21,390,615

Collatz Trajectory (190 steps to reach 1)

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

21,390,615 64,171,846 32,085,923 96,257,770 48,128,885 144,386,656 72,193,328 36,096,664 18,048,332 9,024,166 4,512,083 13,536,250 6,768,125 20,304,376 10,152,188 5,076,094 2,538,047 7,614,142 3,807,071 11,421,214 5,710,607 17,131,822 8,565,911 25,697,734 12,848,867 38,546,602 19,273,301 57,819,904 28,909,952 14,454,976 7,227,488 3,613,744 1,806,872 903,436 451,718 225,859 677,578 338,789 1,016,368 508,184 254,092 127,046 63,523 190,570 95,285 285,856 142,928 71,464 35,732 17,866 8,933 26,800 13,400 6,700 3,350 1,675 5,026 2,513 7,540 3,770

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