11,621

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Number

$11 \, 621$ (eleven thousand, six hundred and twenty-one) is:

The $1398$th prime number

The $4$th after $11 \, 593$, $11 \, 597$, $11 \, 617$ of a sequence of consecutive prime numbers all of the form $4 n + 1$:

$11 \, 621 = 4 \times 2905 + 1$

Also see

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