Is 1221 a deficient number and what is its deficiency?

Is 1221 a deficient number?

Here we will explain and calculate if 1221 is a deficient number and its deficiency if applicable.

1221 is a deficient number if the sum of its proper divisors is less than 1221.

The sum of its proper divisors is calculated as follows: 1 + 3 + 11 + 33 + 37 + 111 + 407 = 603.

603 is less than 1221. Therefore, 1221 is a deficient number.

The deficiency of 1221 is 1221 minus the sum of its proper divisors. Thus, the deficiency of 1221 is 1221 - 603 = 618

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