12211121222111 has 16 divisors (see below), whose sum is σ = 14017443133440. Its totient is φ = 10420274414880.

The previous prime is 12211121222101. The next prime is 12211121222159. The reversal of 12211121222111 is 11122212111221.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 12211121222111 - 2¹⁰ = 12211121221087 is a prime.

It is a super-2 number, since 2×12211121222111² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12211121222101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24547346 + ... + 25039856.

It is an arithmetic number, because the mean of its divisors is an integer number (876090195840).

Almost surely, 2^{12211121222111} is an apocalyptic number.

12211121222111 is a deficient number, since it is larger than the sum of its proper divisors (1806321911329).

12211121222111 is a wasteful number, since it uses less digits than its factorization.

12211121222111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 508214.

The product of its digits is 64, while the sum is 20.

Adding to 12211121222111 its reverse (11122212111221), we get a palindrome (23333333333332).

The spelling of 12211121222111 in words is "twelve trillion, two hundred eleven billion, one hundred twenty-one million, two hundred twenty-two thousand, one hundred eleven".