Question

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Answer 1

Answer:

My DOB is 21 April 2007

So my UN is 21042007 (8-digit)

1)

International system-

21,042,007=21 million 42 thousand and 7

Indian System-

2,10,42,007=2 crore 10 lakhs 42 thousand and 7

2)

successor-21042008

predecessor-21042006

3)

prime factors-

(7)(43)(53)(1319)

4)

Multiples-

(21042007)(2)=42084014

(21042007)(3)=63126021

(21042007)(4)=84168028

5)

Prime digits-

2 that is 2 and 7

6)

Perfect sq-

2 that is 1 and 4

7)

divisibility by 2-

21042007 is not divisible by 2 as its unit digit is an odd number and not an even number.

divisibility by 3-

21042007 is not divisible by 3 as the sum of its digits is 16 which is not divisible by 3

divisibility by 4-

21042007 is not divisible by 4 as its last 2 digits are 07 which is not divisible by 4.

divisibility by 5-

21042007 is not divisible by 5 as its last digit is 7 and not 5 or 0.

divisibility by 6-

21042007 is not divisible by 6 as it is neither divisible by 2 nor by 3

divisibility by 7-

21042007 is divisible by 7 by long division

divisibility by 8-

21042007 is not divisible by 8 as its last 3 digits are 007 which is not divisible by 8.

divisibility by 9-

21042007 is not divisible by 9 as the sum of its digits is 16 which is not divisible by 9.

divisibility by 11-

21042007 is not divisible by 11 as the difference of the sum alternate digits is 2 which is not divisible by 11.

8)

LCM and HCF of 21 and 04 is

LCM=84

HCF=1

Answer 2

Step-by-step explanation:

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