121111220211 has 16 divisors (see below), whose sum is σ = 162773249280. Its totient is φ = 80096464800.

The previous prime is 121111220183. The next prime is 121111220281. The reversal of 121111220211 is 112022111121.

It is a happy number.

It is not a de Polignac number, because 121111220211 - 2⁶ = 121111220147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121111220281) 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, 149680 + ... + 514418.

It is an arithmetic number, because the mean of its divisors is an integer number (10173328080).

Almost surely, 2^121111220211 is an apocalyptic number.

121111220211 is a deficient number, since it is larger than the sum of its proper divisors (41662029069).

121111220211 is a wasteful number, since it uses less digits than its factorization.

121111220211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365626.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 121111220211 its reverse (112022111121), we get a palindrome (233133331332).

The spelling of 121111220211 in words is "one hundred twenty-one billion, one hundred eleven million, two hundred twenty thousand, two hundred eleven".