12106221 has 8 divisors (see below), whose sum is σ = 16159104. Its totient is φ = 8062080.

The previous prime is 12106219. The next prime is 12106223. The reversal of 12106221 is 12260121.

It is an interprime number because it is at equal distance from previous prime (12106219) and next prime (12106223).

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

It is not a de Polignac number, because 12106221 - 2¹ = 12106219 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12106221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12106223) 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, 2461 + ... + 5501.

It is an arithmetic number, because the mean of its divisors is an integer number (2019888).

Almost surely, 2^12106221 is an apocalyptic number.

It is an amenable number.

12106221 is a deficient number, since it is larger than the sum of its proper divisors (4052883).

12106221 is a wasteful number, since it uses less digits than its factorization.

12106221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4371.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 12106221 is about 3479.3995171581. The cubic root of 12106221 is about 229.6163800448.

Adding to 12106221 its reverse (12260121), we get a palindrome (24366342).

The spelling of 12106221 in words is "twelve million, one hundred six thousand, two hundred twenty-one".