12211345 has 8 divisors (see below), whose sum is σ = 14783976. Its totient is φ = 9682176.

The previous prime is 12211343. The next prime is 12211351. The reversal of 12211345 is 54311221.

It can be written as a sum of positive squares in 4 ways, for example, as 1635841 + 10575504 = 1279^2 + 3252^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 12211345 - 2¹ = 12211343 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12211343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10242 + ... + 11371.

It is an arithmetic number, because the mean of its divisors is an integer number (1847997).

Almost surely, 2^12211345 is an apocalyptic number.

It is an amenable number.

12211345 is a deficient number, since it is larger than the sum of its proper divisors (2572631).

12211345 is a wasteful number, since it uses less digits than its factorization.

12211345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21731.

The product of its digits is 240, while the sum is 19.

The square root of 12211345 is about 3494.4734939616. The cubic root of 12211345 is about 230.2790878019.

Adding to 12211345 its reverse (54311221), we get a palindrome (66522566).

The spelling of 12211345 in words is "twelve million, two hundred eleven thousand, three hundred forty-five".