The cubic root of 21952 is 28.
21952 is an esthetic number in base 15, because in such base it adjacent digits differ by 1.
It is a tau number, because it is divible by the number of its divisors (28).
It is a nialpdrome in base 14.
It is a congruent number.
It is an unprimeable number.
21952 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
21952 is a Friedman number, since it can be written as (29-1)^(5-2), using all its digits and the basic arithmetic operations.
221952 is an apocalyptic number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 21952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25400).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21952 is an frugal number, since it uses more digits than its factorization.
21952 is an evil number, because the sum of its binary digits is even.
The square root of 21952 is about 148.1620734196.
The spelling of 21952 in words is "twenty-one thousand, nine hundred fifty-two".