12228123217 has 4 divisors (see below), whose sum is σ = 12241286820. Its totient is φ = 12214959616.

The previous prime is 12228123211. The next prime is 12228123221. The reversal of 12228123217 is 71232182221.

12228123217 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: 71232182221 = 809 ⋅88049669.

It can be written as a sum of positive squares in 2 ways, for example, as 6906274816 + 5321848401 = 83104^2 + 72951^2 .

It is a cyclic number.

It is not a de Polignac number, because 12228123217 - 2¹⁵ = 12228090449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12228123211) by changing a digit.

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, 6580408 + ... + 6582265.

It is an arithmetic number, because the mean of its divisors is an integer number (3060321705).

Almost surely, 2^12228123217 is an apocalyptic number.

It is an amenable number.

12228123217 is a deficient number, since it is larger than the sum of its proper divisors (13163603).

12228123217 is an equidigital number, since it uses as much as digits as its factorization.

12228123217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13163602.

The product of its digits is 5376, while the sum is 31.

The spelling of 12228123217 in words is "twelve billion, two hundred twenty-eight million, one hundred twenty-three thousand, two hundred seventeen".