12012221 has 16 divisors (see below), whose sum is σ = 13698048.
Its totient is φ = 10454400.
The previous prime is 12012197. The next prime is 12012257. The reversal of 12012221 is 12221021.
It is a happy number.
12012221 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.
It is a cyclic number.
It is not a de Polignac number, because 12012221 - 26 = 12012157 is a prime.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (12012271) by changing a digit.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16160 + ... + 16886.
It is an arithmetic number, because the mean of its divisors is an integer number (856128).
Almost surely, 212012221 is an apocalyptic number.
It is an amenable number.
12012221 is a deficient number, since it is larger than the sum of its proper divisors (1685827).
12012221 is a wasteful number, since it uses less digits than its factorization.
12012221 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 812.
The product of its (nonzero) digits is 16, while the sum is 11.
The square root of 12012221 is about 3465.8651156674.
The cubic root of 12012221 is about 229.0205418794.
Adding to 12012221 its reverse (12221021), we get a palindrome (24233242).
The spelling of 12012221 in words is "twelve million, twelve thousand, two hundred twenty-one".