12121120212111 has 12 divisors (see below), whose sum is σ = 17719227941688. Its totient is φ = 7983388412304.

The previous prime is 12121120212043. The next prime is 12121120212121. The reversal of 12121120212111 is 11121202112121.

It is a happy number.

12121120212111 is a `hidden beast` number, since 121 + 211 + 202 + 121 + 11 = 666.

It is not a de Polignac number, because 12121120212111 - 2²³ = 12121111823503 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121120212121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8113198860 + ... + 8113200353.

It is an arithmetic number, because the mean of its divisors is an integer number (1476602328474).

Almost surely, 2^{12121120212111} is an apocalyptic number.

12121120212111 is a deficient number, since it is larger than the sum of its proper divisors (5598107729577).

12121120212111 is a wasteful number, since it uses less digits than its factorization.

12121120212111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16226399302 (or 16226399299 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 12121120212111 its reverse (11121202112121), we get a palindrome (23242322324232).

The spelling of 12121120212111 in words is "twelve trillion, one hundred twenty-one billion, one hundred twenty million, two hundred twelve thousand, one hundred eleven".