a
reference to a very large number. The
word power means how many
times a number is multiplied by itself, thus, ten to the twenty-first
power means 10 multiplied by itself 21
times or 1,000,000,000,000,000,000,000. "
Binary digits" are either of the digits 0 or 1 of the binary system of
numbers-that system of numbering that employs only 0s and 1s. The
phrase ten-to-the-twenty-first-
power binary digits then refers to 1,000,000,000,000,000,000,000 of the 0s and 1s strung out one after another.