21,955

5 × 4391

Prime Factor Structure

Factorization String 5 × 4391

Distinct Prime Factors 2

Square Status No

Abundance Measure Deficient

Total Divisors 4

Divisor Sum (σ) 26,352

Proper Divisor Sum 4,397

Digit Sum / Digital Root 22 (Root: 4)

Adjacent Primes #21943 ← → #21961

1 5 4,391 21,955

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

21,955 65,866 32,933 98,800 49,400 24,700 12,350 6,175 18,526 9,263 27,790 13,895 41,686 20,843 62,530 31,265 93,796 46,898 23,449 70,348 35,174 17,587 52,762 26,381 79,144 39,572 19,786 9,893 29,680 14,840 7,420 3,710 1,855 5,566 2,783 8,350 4,175 12,526 6,263 18,790 9,395 28,186 14,093 42,280 21,140 10,570 5,285 15,856 7,928 3,964 1,982 991 2,974 1,487 4,462 2,231 6,694 3,347 10,042 5,021

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