It is a sphenic number, since it is the product of 3 distinct primes.
21174 is an admirable number.
It is a Curzon number.
It is a plaindrome in base 11.
It is a congruent number.
221174 is an apocalyptic number.
21174 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.
21174 is a wasteful number, since it uses less digits than its factorization.
21174 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 3534.
The square root of 21174 is about 145.5128860273. The cubic root of 21174 is about 27.6652311315.
Adding to 21174 its reverse (47112), we get a palindrome (68286).
The spelling of 21174 in words is "twenty-one thousand, one hundred seventy-four", and thus it is an iban number.