12221203123 has 4 divisors (see below), whose sum is σ = 12864424360. Its totient is φ = 11577981888.

The previous prime is 12221203097. The next prime is 12221203177. The reversal of 12221203123 is 32130212221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12221203123 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 643221217 = 12221203123 / (1 + 2 + 2 + 2 + 1 + 2 + 0 + 3 + 1 + 2 + 3).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12221203123.

It is not an unprimeable number, because it can be changed into a prime (12221203723) 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, 321610590 + ... + 321610627.

It is an arithmetic number, because the mean of its divisors is an integer number (3216106090).

Almost surely, 2^12221203123 is an apocalyptic number.

12221203123 is a deficient number, since it is larger than the sum of its proper divisors (643221237).

12221203123 is an equidigital number, since it uses as much as digits as its factorization.

12221203123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643221236.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 12221203123 its reverse (32130212221), we get a palindrome (44351415344).

The spelling of 12221203123 in words is "twelve billion, two hundred twenty-one million, two hundred three thousand, one hundred twenty-three".