21532 is an admirable number.
It is a congruent number.
It is an unprimeable number.
221532 is an apocalyptic number.
It is an amenable number.
21532 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21532 is a wasteful number, since it uses less digits than its factorization.
21532 is an evil number, because the sum of its binary digits is even.
The square root of 21532 is about 146.7378615082. The cubic root of 21532 is about 27.8202774613.
The spelling of 21532 in words is "twenty-one thousand, five hundred thirty-two".