12120211111111 has 8 divisors (see below), whose sum is σ = 12402161396240. Its totient is φ = 11838264685632.

The previous prime is 12120211111091. The next prime is 12120211111117. The reversal of 12120211111111 is 11111111202121.

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 12120211111111 - 2¹¹ = 12120211109063 is a prime.

It is a Duffinian number.

12120211111111 is a modest number, since divided by 11111111 gives 121202 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12120211111117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5960005 + ... + 7730593.

It is an arithmetic number, because the mean of its divisors is an integer number (1550270174530).

Almost surely, 2^{12120211111111} is an apocalyptic number.

12120211111111 is a deficient number, since it is larger than the sum of its proper divisors (281950285129).

12120211111111 is a wasteful number, since it uses less digits than its factorization.

12120211111111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1929825.

The product of its (nonzero) digits is 8, while the sum is 16.

Adding to 12120211111111 its reverse (11111111202121), we get a palindrome (23231322313232).

The spelling of 12120211111111 in words is "twelve trillion, one hundred twenty billion, two hundred eleven million, one hundred eleven thousand, one hundred eleven".