12189221 has 8 divisors (see below), whose sum is σ = 14079744. Its totient is φ = 10429120.

The previous prime is 12189181. The next prime is 12189257. The reversal of 12189221 is 12298121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12189221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12189521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32405 + ... + 32778.

It is an arithmetic number, because the mean of its divisors is an integer number (1759968).

Almost surely, 2^12189221 is an apocalyptic number.

12189221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12189221 is a deficient number, since it is larger than the sum of its proper divisors (1890523).

12189221 is a wasteful number, since it uses less digits than its factorization.

12189221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65211.

The product of its digits is 576, while the sum is 26.

The square root of 12189221 is about 3491.3064889809. The cubic root of 12189221 is about 230.1399337496.

Subtracting 12189221 from its reverse (12298121), we obtain a square (108900 = 330²).

The spelling of 12189221 in words is "twelve million, one hundred eighty-nine thousand, two hundred twenty-one".