12027221 has 4 divisors (see below), whose sum is σ = 12036000. Its totient is φ = 12018444.

The previous prime is 12027179. The next prime is 12027271. The reversal of 12027221 is 12272021.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12272021 = 317 ⋅38713.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12027221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12027221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12027271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1841 + ... + 5238.

It is an arithmetic number, because the mean of its divisors is an integer number (3009000).

Almost surely, 2^12027221 is an apocalyptic number.

It is an amenable number.

12027221 is a deficient number, since it is larger than the sum of its proper divisors (8779).

12027221 is an equidigital number, since it uses as much as digits as its factorization.

12027221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8778.

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 12027221 is about 3468.0284024212. The cubic root of 12027221 is about 229.1158303693.

Adding to 12027221 its reverse (12272021), we get a palindrome (24299242).

The spelling of 12027221 in words is "twelve million, twenty-seven thousand, two hundred twenty-one".