70,721

7 × 10103

Starting at 70,721, the Collatz iteration reaches 1 after 81 steps. The first transition is 212164; the starting value is odd with 4 positive divisors.

Prime Factor Structure

Factorization String 7 × 10103

Distinct Prime Factors 2

Square Status No

Abundance Measure Deficient

Analytical Properties

Total Divisors 4

Divisor Sum (σ) 80,832

Proper Divisor Sum 10,111

Digit Sum / Digital Root 17 (Root: 8)

Adjacent Primes #70717 ← → #70729

Radix Representation

Decimal	70721
Binary	10001010001000001 (17 bits)
Octal	0o212101
Hexadecimal	0x11441

Divisor Catalog (4)

1 7 10,103 70,721

Collatz Trajectory (81 steps to reach 1)

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

70,721 212,164 106,082 53,041 159,124 79,562 39,781 119,344 59,672 29,836 14,918 7,459 22,378 11,189 33,568 16,784 8,392 4,196 2,098 1,049 3,148 1,574 787 2,362 1,181 3,544 1,772 886 443 1,330 665 1,996 998 499 1,498 749 2,248 1,124 562 281 844 422 211 634 317 952 476 238 119 358 179 538 269 808 404 202 101 304 152 76

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