Adding to 21472 its reverse (27412), we get a palindrome (48884).
21472 is an esthetic number in base 15, because in such base its adjacent digits differ by 1.
It is an alternating number because its digits alternate between even and odd.
It is a congruent number.
It is an unprimeable number.
221472 is an apocalyptic number.
21472 is a gapful number since it is divisible by the number (22) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 21472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23436).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21472 is a wasteful number, since it uses less digits than its factorization.
21472 is an odious number, because the sum of its binary digits is odd.
The square root of 21472 is about 146.5332726721. The cubic root of 21472 is about 27.7944125548.
The spelling of 21472 in words is "twenty-one thousand, four hundred seventy-two", and thus it is an iban number.