121211201110111 has 8 divisors (see below), whose sum is σ = 141354170391200. Its totient is φ = 103895315236944.

The previous prime is 121211201110099. The next prime is 121211201110151. The reversal of 121211201110111 is 111011102112121.

It is not a de Polignac number, because 121211201110111 - 2⁹ = 121211201109599 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 (121211201110151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 176692712646 + ... + 176692713331.

It is an arithmetic number, because the mean of its divisors is an integer number (17669271298900).

Almost surely, 2^{121211201110111} is an apocalyptic number.

121211201110111 is a deficient number, since it is larger than the sum of its proper divisors (20142969281089).

121211201110111 is an frugal number, since it uses more digits than its factorization.

121211201110111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353385425998 (or 353385425984 counting only the distinct ones).

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

Adding to 121211201110111 its reverse (111011102112121), we get a palindrome (232222303222232).

The spelling of 121211201110111 in words is "one hundred twenty-one trillion, two hundred eleven billion, two hundred one million, one hundred ten thousand, one hundred eleven".