11112134211221 has 4 divisors (see below), whose sum is σ = 11112152976492. Its totient is φ = 11112115445952.

The previous prime is 11112134211197. The next prime is 11112134211239. The reversal of 11112134211221 is 12211243121111.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7477430091121 + 3634704120100 = 2734489^2 + 1906490^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11112134211221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11112134211721) 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, 8464436 + ... + 9688701.

It is an arithmetic number, because the mean of its divisors is an integer number (2778038244123).

Almost surely, 2^{11112134211221} is an apocalyptic number.

It is an amenable number.

11112134211221 is a deficient number, since it is larger than the sum of its proper divisors (18765271).

11112134211221 is an equidigital number, since it uses as much as digits as its factorization.

11112134211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18765270.

The product of its digits is 192, while the sum is 23.

Adding to 11112134211221 its reverse (12211243121111), we get a palindrome (23323377332332).

The spelling of 11112134211221 in words is "eleven trillion, one hundred twelve billion, one hundred thirty-four million, two hundred eleven thousand, two hundred twenty-one".