21,393,729

3² × 7 × 339583

Prime Factor Structure

Factorization String 3^2 × 7 × 339583

Distinct Prime Factors 3

Square Status No

Abundance Measure Deficient

Total Divisors 12

Divisor Sum (σ) 35,316,736

Proper Divisor Sum 13,923,007

Digit Sum / Digital Root 36 (Root: 9)

Adjacent Primes #21393727 ← → #21393739

1 3 7 9 21 63 339,583 1,018,749 2,377,081 3,056,247 7,131,243 21,393,729

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

21,393,729 64,181,188 32,090,594 16,045,297 48,135,892 24,067,946 12,033,973 36,101,920 18,050,960 9,025,480 4,512,740 2,256,370 1,128,185 3,384,556 1,692,278 846,139 2,538,418 1,269,209 3,807,628 1,903,814 951,907 2,855,722 1,427,861 4,283,584 2,141,792 1,070,896 535,448 267,724 133,862 66,931 200,794 100,397 301,192 150,596 75,298 37,649 112,948 56,474 28,237 84,712 42,356 21,178 10,589 31,768 15,884 7,942 3,971 11,914 5,957 17,872 8,936 4,468 2,234 1,117 3,352 1,676 838 419 1,258 629

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