12212112122111 has 16 divisors (see below), whose sum is σ = 14023734042240. Its totient is φ = 10517416521120.

The previous prime is 12212112122033. The next prime is 12212112122129. The reversal of 12212112122111 is 11122121121221.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12212112122111 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 (12212112122141) 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, 11601521 + ... + 12610293.

It is an arithmetic number, because the mean of its divisors is an integer number (876483377640).

Almost surely, 2^{12212112122111} is an apocalyptic number.

12212112122111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12212112122111 is a deficient number, since it is larger than the sum of its proper divisors (1811621920129).

12212112122111 is a wasteful number, since it uses less digits than its factorization.

12212112122111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1066726.

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

Adding to 12212112122111 its reverse (11122121121221), we get a palindrome (23334233243332).

It can be divided in two parts, 122121121221 and 11, that multiplied together give a palindrome (1343332333431).

The spelling of 12212112122111 in words is "twelve trillion, two hundred twelve billion, one hundred twelve million, one hundred twenty-two thousand, one hundred eleven".