12211121111121 has 6 divisors (see below), whose sum is σ = 17638286049410. Its totient is φ = 8140747407408.

The previous prime is 12211121111099. The next prime is 12211121111173. The reversal of 12211121111121 is 12111112111221.

It can be written as a sum of positive squares in only one way, i.e., 10814791302225 + 1396329808896 = 3288585^2 + 1181664^2 .

It is not a de Polignac number, because 12211121111121 - 2⁹ = 12211121110609 is a prime.

It is a super-2 number, since 2×12211121111121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12211121111094 and 12211121111103.

It is not an unprimeable number, because it can be changed into a prime (12211121111921) 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 5 ways as a sum of consecutive naturals, for example, 678395617276 + ... + 678395617293.

Almost surely, 2^{12211121111121} is an apocalyptic number.

It is an amenable number.

12211121111121 is a deficient number, since it is larger than the sum of its proper divisors (5427164938289).

12211121111121 is a wasteful number, since it uses less digits than its factorization.

12211121111121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1356791234575 (or 1356791234572 counting only the distinct ones).

The product of its digits is 16, while the sum is 18.

Adding to 12211121111121 its reverse (12111112111221), we get a palindrome (24322233222342).

The spelling of 12211121111121 in words is "twelve trillion, two hundred eleven billion, one hundred twenty-one million, one hundred eleven thousand, one hundred twenty-one".