12211745 has 16 divisors (see below), whose sum is σ = 18036480. Its totient is φ = 7729344.

The previous prime is 12211723. The next prime is 12211747. The reversal of 12211745 is 54711221.

It is not a de Polignac number, because 12211745 - 2¹⁰ = 12210721 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 12211745.

It is not an unprimeable number, because it can be changed into a prime (12211747) 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 15 ways as a sum of consecutive naturals, for example, 12965 + ... + 13874.

It is an arithmetic number, because the mean of its divisors is an integer number (1127280).

Almost surely, 2^12211745 is an apocalyptic number.

It is an amenable number.

12211745 is a deficient number, since it is larger than the sum of its proper divisors (5824735).

12211745 is a wasteful number, since it uses less digits than its factorization.

12211745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26864.

The product of its digits is 560, while the sum is 23.

The square root of 12211745 is about 3494.5307267214. The cubic root of 12211745 is about 230.2816021476.

Adding to 12211745 its reverse (54711221), we get a palindrome (66922966).

The spelling of 12211745 in words is "twelve million, two hundred eleven thousand, seven hundred forty-five".