21,275

5² × 23 × 37

Prime Factor Structure

Factorization String 5^2 × 23 × 37

Distinct Prime Factors 3

Square Status No

Abundance Measure Deficient

Total Divisors 12

Divisor Sum (σ) 28,272

Proper Divisor Sum 6,997

Digit Sum / Digital Root 17 (Root: 8)

Adjacent Primes #21269 ← → #21277

1 5 23 25 37 115 185 575 851 925 4,255 21,275

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

21,275 63,826 31,913 95,740 47,870 23,935 71,806 35,903 107,710 53,855 161,566 80,783 242,350 121,175 363,526 181,763 545,290 272,645 817,936 408,968 204,484 102,242 51,121 153,364 76,682 38,341 115,024 57,512 28,756 14,378 7,189 21,568 10,784 5,392 2,696 1,348 674 337 1,012 506 253 760 380 190 95 286 143 430 215 646 323 970 485 1,456 728 364 182 91 274 137

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