12111113221 has 8 divisors (see below), whose sum is σ = 12147108120. Its totient is φ = 12075171072.

The previous prime is 12111113177. The next prime is 12111113233. The reversal of 12111113221 is 12231111121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 36180225 + 12074932996 = 6015^2 + 109886^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12111113221 - 2⁹ = 12111112709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12111113195 and 12111113204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12111113281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 472881 + ... + 497833.

It is an arithmetic number, because the mean of its divisors is an integer number (1518388515).

Almost surely, 2^12111113221 is an apocalyptic number.

It is an amenable number.

12111113221 is a deficient number, since it is larger than the sum of its proper divisors (35994899).

12111113221 is an equidigital number, since it uses as much as digits as its factorization.

12111113221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26375.

The product of its digits is 24, while the sum is 16.

Adding to 12111113221 its reverse (12231111121), we get a palindrome (24342224342).

The spelling of 12111113221 in words is "twelve billion, one hundred eleven million, one hundred thirteen thousand, two hundred twenty-one".