It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10021 = 11 ⋅911.
It is a cyclic number.
It is a Duffinian number.
212001 is an apocalyptic number.
12001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.
It is an amenable number.
12001 is a wasteful number, since it uses less digits than its factorization.
12001 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1102.
The square root of 12001 is about 109.5490757606. The cubic root of 12001 is about 22.8949207858.
Adding to 12001 its reverse (10021), we get a palindrome (22022).
Multiplying 12001 by its reverse (10021), we get a palindrome (120262021).
The spelling of 12001 in words is "twelve thousand, one", and thus it is an iban number.