Adding to 21235 its reverse (53212), we get a palindrome (74447).
It is a sphenic number, since it is the product of 3 distinct primes.
It is a d-powerful number, because it can be written as 212 + 1 + 214 + 36 + 52 .
It is a Duffinian number.
It is a nialpdrome in base 13.
It is an unprimeable number.
221235 is an apocalyptic number.
21235 is a wasteful number, since it uses less digits than its factorization.
21235 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 173.
The square root of 21235 is about 145.7223387130. The cubic root of 21235 is about 27.6917725047.
The spelling of 21235 in words is "twenty-one thousand, two hundred thirty-five".