12011112221 has 8 divisors (see below), whose sum is σ = 12721654584. Its totient is φ = 11301015040.

The previous prime is 12011112209. The next prime is 12011112251. The reversal of 12011112221 is 12221111021.

It can be written as a sum of positive squares in 4 ways, for example, as 5533276996 + 6477835225 = 74386^2 + 80485^2 .

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 12011112221 - 2¹⁰ = 12011111197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12011112196 and 12011112205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12011112251) 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 7 ways as a sum of consecutive naturals, for example, 54920 + ... + 164433.

It is an arithmetic number, because the mean of its divisors is an integer number (1590206823).

Almost surely, 2^12011112221 is an apocalyptic number.

It is an amenable number.

12011112221 is a deficient number, since it is larger than the sum of its proper divisors (710542363).

12011112221 is a wasteful number, since it uses less digits than its factorization.

12011112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222591.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 12011112221 its reverse (12221111021), we get a palindrome (24232223242).

The spelling of 12011112221 in words is "twelve billion, eleven million, one hundred twelve thousand, two hundred twenty-one".