The prime factors of 84 are 7, 3 and 2. When 7 is multiplied by 3, 2 and then 2 again, the result is the original 84.

The number "84" in the krypton-84 indicates the mass number of this particular isotope, which is the sum of protons and neutrons in the nucleus. It is also approximately equal to the atomic weight of the isotope.

The number 121 is not a prime number. A prime number must have only two factors, 1 and the number itself. However, the number 121 has three factors as 11 is a also factor of 121 in addition to 1 and 121 itself.


The prime factors of 6 are 2 and 3. The number 6 cannot be factorized into any other combination of prime numbers. A prime number is a whole number larger than 1 which can only be divided by 1 and itself.

The prime factors of 45 are three, three and five. These three numbers represent the unique combination of prime numbers that, when multiplied together, produce 45 as an answer.

The number 69 is not a prime number, as it has the factors of 3 and 23. A prime number is one which is only evenly divisible by itself and the number 1.

The prime factorization of 35 is 5 and 7. Prime factors are numbers that are only divisible by themselves and one. While every number is divisible by one, most mathematicians do not consider it as a prime factor.