12126221 has 8 divisors (see below), whose sum is σ = 12747840. Its totient is φ = 11512512.

The previous prime is 12126197. The next prime is 12126223. The reversal of 12126221 is 12262121.

12126221 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 12126221 - 2⁶ = 12126157 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 12126221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12126223) 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, 1301 + ... + 5093.

It is an arithmetic number, because the mean of its divisors is an integer number (1593480).

Almost surely, 2^12126221 is an apocalyptic number.

It is an amenable number.

12126221 is a deficient number, since it is larger than the sum of its proper divisors (621619).

12126221 is a wasteful number, since it uses less digits than its factorization.

12126221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3955.

The product of its digits is 96, while the sum is 17.

The square root of 12126221 is about 3482.2723902647. The cubic root of 12126221 is about 229.7427558701.

Adding to 12126221 its reverse (12262121), we get a palindrome (24388342).

The spelling of 12126221 in words is "twelve million, one hundred twenty-six thousand, two hundred twenty-one".