GDT (MathBabber is a GDT character) was

21,420days young when he did his first class of the spring 2016 semester. [21,420days was 58 years, 7 months, 22 days (or 30,844,800 minutes)]MathBabbler Number Analyst (MBNA) output: ========================================= 21420 is a natural, whole, integer 21420 is even 21420 proper divisors are: 1,2,3,4,5,6,7,9,10,12,14,15,17,18,20,21,28, 30,34,35,36,42,45,51,60,63,68,70,84,85,90, 102,105,119,126,140,153,170,180,204,210,238, 252,255,306,315,340,357,420,476,510,595,612, 630,714,765,1020,1071,1190,1260,1428,1530, 1785,2142,2380,3060,3570,4284,5355,7140,10710, 21420 has 71 proper divisors 21420 is abundant (sum of divisors is 57204; ratio: 2.67059) 21420 is unhappy 21420 is not a Squarefree Number: 4,9,36, 21420 is Harshad (Niven) number 21420 is composite (not prime) 21420 has the prime factors: 2*2*3*3*5*7*17 (sum=39) 21420 is a 17-smooth number 21420 is Arithmetic (A003601) 21420 is not in A038853 21420 in octal is 051654 21420 in hexadecimal is 0x53ac 21420 in binary is 101001110101100 (is evil) 21420 nearest square numbers: -104...189 (21316...21609 [147]) sqrt(21420) = 146.356 ln(21420) = 9.97208 log(21420) = 4.33082 21420 reciprocal is .00004668534080298786181139122315 21420 is an apocalyptic power 21420! is inf 21420 is 6818.2 Pi years 21420 is 1071 scoreyears 21420 is 5356^2 - 5354^2 and 2 * (5356 + 5354) 21420 is a multiple of 1 & it contains a 1 (A011531) 21420 is a multiple of 2 & it contains a 2 (A121022) 21420 is a multiple of 4 & it contains a 4 (A121024) 21420 is a multiple of 14 & it contains a 14 (A121034) 21420 is a multiple of 21 & it contains a 21 21420 is a multiple of 42 & it contains a 42 21420 is a multiple of 420 & it contains a 420 21420 is a multiple of 2142 & it contains a 2142

**Creator:** Gerald Thurman
[gthurman@gmail.com]

**Created:** 13 January 2016

This work is licensed under a Creative Commons Attribution 3.0 United States License.