12221123345 has 4 divisors (see below), whose sum is σ = 14665348020. Its totient is φ = 9776898672.

The previous prime is 12221123329. The next prime is 12221123351. The reversal of 12221123345 is 54332112221.

12221123345 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54332112221 = 1303 ⋅41697707.

It can be written as a sum of positive squares in 2 ways, for example, as 9240400129 + 2980723216 = 96127^2 + 54596^2 .

It is a cyclic number.

It is not a de Polignac number, because 12221123345 - 2⁴ = 12221123329 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1222112330 + ... + 1222112339.

It is an arithmetic number, because the mean of its divisors is an integer number (3666337005).

Almost surely, 2^12221123345 is an apocalyptic number.

It is an amenable number.

12221123345 is a deficient number, since it is larger than the sum of its proper divisors (2444224675).

12221123345 is an equidigital number, since it uses as much as digits as its factorization.

12221123345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2444224674.

The product of its digits is 2880, while the sum is 26.

Adding to 12221123345 its reverse (54332112221), we get a palindrome (66553235566).

The spelling of 12221123345 in words is "twelve billion, two hundred twenty-one million, one hundred twenty-three thousand, three hundred forty-five".