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As a biprime with proper divisors 1, 3 and 7, twenty-one has a prime aliquot sum of 11 within an aliquot sequence containing only one composite number (21, 11, 1, 0); it is the second composite number with an aliquot sum of 11, following 18. 21 is the first member of the second cluster of consecutive discrete semiprimes (21, 22), where the next such cluster is (33, 34, 35).
The ship was delivered to the Navy on 21 August 2009 at New Orleans. She set sail for Norfolk, Virginia, on 13 October 2009. [14] On 2 November 2009 the ship passed the World Trade Center site for the first time and gave the site a 21-gun salute. [3] [15]
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[7] [8] In Australia, the album peaked at number 13. [9] It was certified "Gold" in the UK by the BPI in July 1980. The title track became one of her most successful singles, peaking at number 21 over an 11-week stay in the UK Singles Chart. [7] It was also used in the soundtrack of an Australian movie of the same title made in 1999. "All the ...
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The sun disk of the emblem contains 21 rays of equal size and shape. The number 21 also symbolizes March 21, the holiday of Newroz, which is the Kurdish New Year. [1 ...
The MiG-21 jet fighter was a continuation of Soviet jet fighters, starting with the subsonic MiG-15 and MiG-17, and the supersonic MiG-19.A number of experimental Mach 2 Soviet designs were based on nose intakes with either swept-back wings, such as the Sukhoi Su-7, or tailed deltas, of which the MiG-21 would be the most successful.
The Whitehead No.21 was the aircraft that aviation pioneer Gustave Whitehead claimed to have flown near Bridgeport, Connecticut on August 14, 1901. Professional aviation historians and scholars reject claims for the flight.