It is a happy number.
It is a tau number, because it is divible by the number of its divisors (18).
It is an ABA number since it can be written as A⋅BA, here for A=2, B=81.
It is a nude number because it is divisible by every one of its digits.
It is a nialpdrome in base 3 and base 9.
213122 is an apocalyptic number.
It is a practical number, because each smaller number is the sum of distinct divisors of 13122
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
13122 is an frugal number, since it uses more digits than its factorization.
13122 is an evil number, because the sum of its binary digits is even.
The square root of 13122 is about 114.5512985522. The cubic root of 13122 is about 23.5866725479.
Multiplying 13122 by its product of digits (12), we get a cube (157464 = 543).
Adding to 13122 its reverse (22131), we get a palindrome (35253).
Subtracting 13122 from its reverse (22131), we obtain a palindrome (9009).
The spelling of 13122 in words is "thirteen thousand, one hundred twenty-two".