### About the Number 21,129 (twenty-one thousand one hundred twenty-nine)

MathBabbler was lamenting about how next month he will turn 58 years young. TimeAndDate.com calculated that 58 years is 21,129 days (57 years, 10 months, 6 days).

```MathBabbler Number Analyst (MBNA) output:
=========================================
21129 is a natural, whole, integer
21129 is odd
21129 proper divisors are: 1,3,7043,
21129 has 3 proper divisors
21129 is deficient (sum of divisors is 7047; ratio: 0.333523)
21129 is happy
21129 is a Squarefree Number
21129 is composite (not prime)
21129 has the prime factors: 3*7043 (sum=7046)
21129 is semiprime (biprime or 2-almost prime)
21129 is Arithmetic (A003601)
21129 in octal is 051211
21129 in hexadecimal is 0x5289
21129 in binary is 101001010001001 (is evil)
21129 nearest square numbers: -104...187 (21025...21316 )
sqrt(21129) = 145.358
ln(21129) = 9.9584
log(21129) = 4.32488
21129 reciprocal is .00004732831653178096455109091769
21129 is an apocalyptic power
21129! is inf
21129 is 6725.57 Pi years
21129 is 1056 score and 9 years
21129 is 10565^2 - 10564^2 and 10565 + 10564 = 21129
21129 is a multiple of 1 & it contains a 1 (A011531)
```

Creator: Gerald Thurman [gthurman@gmail.com]
Created: 03 April 2015 (posted 04 April 2015) 