21,018,478

2 × 13 × 661 × 1223

21,018,478 factors as 2 × 13 × 661 × 1223. Its 16 positive divisors give a proper-divisor sum of 13,013,618, so this integer is deficient. The Collatz stopping time is 221 steps.

Prime Factor Structure

Factorization String 2 × 13 × 661 × 1223

Distinct Prime Factors 4

Square Status No

Abundance Measure Deficient

Analytical Properties

Total Divisors 16

Divisor Sum (σ) 34,032,096

Proper Divisor Sum 13,013,618

Digit Sum / Digital Root 31 (Root: 4)

Adjacent Primes #21018469 ← → #21018497

Radix Representation

Decimal	21018478
Binary	1010000001011011101101110 (25 bits)
Octal	0o120133556
Hexadecimal	0x140B76E

Divisor Catalog (16)

1 2 13 26 661 1,223 1,322 2,446 8,593 15,899 17,186 31,798 808,403 1,616,806 10,509,239 21,018,478

Collatz Trajectory (221 steps to reach 1)

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

21,018,478 10,509,239 31,527,718 15,763,859 47,291,578 23,645,789 70,937,368 35,468,684 17,734,342 8,867,171 26,601,514 13,300,757 39,902,272 19,951,136 9,975,568 4,987,784 2,493,892 1,246,946 623,473 1,870,420 935,210 467,605 1,402,816 701,408 350,704 175,352 87,676 43,838 21,919 65,758 32,879 98,638 49,319 147,958 73,979 221,938 110,969 332,908 166,454 83,227 249,682 124,841 374,524 187,262 93,631 280,894 140,447 421,342 210,671 632,014 316,007 948,022 474,011 1,422,034 711,017 2,133,052 1,066,526 533,263 1,599,790 799,895

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