10101
You is called a prime number!You is called a prime number!You is called a prime number!You is called a prime number!
A prime number times a prime number is a composite number. Since prime numbers, except for 2, are odd numbers, a prime number times a prime number is usually an odd number. It will only be an even number if one of the prime numbers is 2. A prime number times a prime number will be a number with four factors unless both prime numbers are the same, in which case it will be a square number with only three factors.
101 is a prime number. The only factor of 101 is itself and 1.prime
19 is a prime number.19 is a prime number.19 is a prime number.19 is a prime number.
10101 is a composite number. A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite.
The binary number 10101 represents 21.
10101
10101
3, 190 and 10101
The number 21 in binary is 10101
The number 21 in binary is 10101
16 + 4 + 1 =21
01000101 01011 10101 110101 1010101 101110 11001 11010110 0010101 010101 010101 10101 10101 11101010 10000101 1001 0101011 101101010001 10101 101010 101010 110001001 1010 101 1001 0101001 1000101 101010 1010101 10101 010101 010101 1010010 101001 001010 10101001 10101 1010010 101001 10101 10101 11001
assuming 10101 is hexadecimal, EFEFE.
21
3 * 7 * 13 * 37= 10101