It is a sphenic number, since it is the product of 3 distinct primes.
It is an alternating number because its digits alternate between even and odd.
It is a nialpdrome in base 13.
It is a self number, because there is not a number n which added to its sum of digits gives 21034.
It is a congruent number.
221034 is an apocalyptic number.
21034 is a wasteful number, since it uses less digits than its factorization.
21034 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 824.
The square root of 21034 is about 145.0310311623. The cubic root of 21034 is about 27.6041231675.
Adding to 21034 its reverse (43012), we get a palindrome (64046).
The spelling of 21034 in words is "twenty-one thousand, thirty-four".