12221144123 has 4 divisors (see below), whose sum is σ = 12230715600. Its totient is φ = 12211572648.

The previous prime is 12221144107. The next prime is 12221144137. The reversal of 12221144123 is 32144112221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32144112221 = 13 ⋅2472624017.

It is a cyclic number.

It is not a de Polignac number, because 12221144123 - 2⁴ = 12221144107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12221144153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4783823 + ... + 4786376.

It is an arithmetic number, because the mean of its divisors is an integer number (3057678900).

Almost surely, 2^12221144123 is an apocalyptic number.

12221144123 is a deficient number, since it is larger than the sum of its proper divisors (9571477).

12221144123 is an equidigital number, since it uses as much as digits as its factorization.

12221144123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9571476.

The product of its digits is 768, while the sum is 23.

Adding to 12221144123 its reverse (32144112221), we get a palindrome (44365256344).

The spelling of 12221144123 in words is "twelve billion, two hundred twenty-one million, one hundred forty-four thousand, one hundred twenty-three".