12221111121 has 32 divisors (see below), whose sum is σ = 17295753216. Its totient is φ = 7663248000.

The previous prime is 12221111107. The next prime is 12221111173. The reversal of 12221111121 is 12111112221.

It is a happy number.

It is not a de Polignac number, because 12221111121 - 2⁶ = 12221111057 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12221111121.

It is not an unprimeable number, because it can be changed into a prime (12221111101) 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 31 ways as a sum of consecutive naturals, for example, 1027410 + ... + 1039236.

It is an arithmetic number, because the mean of its divisors is an integer number (540492288).

Almost surely, 2^12221111121 is an apocalyptic number.

It is an amenable number.

12221111121 is a deficient number, since it is larger than the sum of its proper divisors (5074642095).

12221111121 is a wasteful number, since it uses less digits than its factorization.

12221111121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12173.

The product of its digits is 16, while the sum is 15.

Adding to 12221111121 its reverse (12111112221), we get a palindrome (24332223342).

The spelling of 12221111121 in words is "twelve billion, two hundred twenty-one million, one hundred eleven thousand, one hundred twenty-one".