12221320123 has 4 divisors (see below), whose sum is σ = 12615556288. Its totient is φ = 11827083960.

The previous prime is 12221320117. The next prime is 12221320147. The reversal of 12221320123 is 32102312221.

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

It is a cyclic number.

It is not a de Polignac number, because 12221320123 - 2⁹ = 12221319611 is a prime.

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 12221320123.

It is not an unprimeable number, because it can be changed into a prime (12221320193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197118036 + ... + 197118097.

It is an arithmetic number, because the mean of its divisors is an integer number (3153889072).

Almost surely, 2^12221320123 is an apocalyptic number.

12221320123 is a deficient number, since it is larger than the sum of its proper divisors (394236165).

12221320123 is an equidigital number, since it uses as much as digits as its factorization.

12221320123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394236164.

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

Adding to 12221320123 its reverse (32102312221), we get a palindrome (44323632344).

The spelling of 12221320123 in words is "twelve billion, two hundred twenty-one million, three hundred twenty thousand, one hundred twenty-three".