Is 2021 a deficient number and what is its deficiency?

Is 2021 a deficient number?

Here we will explain and calculate if 2021 is a deficient number and its deficiency if applicable.

2021 is a deficient number if the sum of its proper divisors is less than 2021.

The sum of its proper divisors is calculated as follows: 1 + 43 + 47 = 91.

91 is less than 2021. Therefore, 2021 is a deficient number.

The deficiency of 2021 is 2021 minus the sum of its proper divisors. Thus, the deficiency of 2021 is 2021 - 91 = 1930

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