121110111121111 has 8 divisors (see below), whose sum is σ = 141236281191200. Its totient is φ = 103808666674944.

The previous prime is 121110111121057. The next prime is 121110111121127. The reversal of 121110111121111 is 111121111011121.

It is not a de Polignac number, because 121110111121111 - 2¹⁷ = 121110110990039 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 (121110111121171) 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, 176545351146 + ... + 176545351831.

It is an arithmetic number, because the mean of its divisors is an integer number (17654535148900).

Almost surely, 2^{121110111121111} is an apocalyptic number.

121110111121111 is a deficient number, since it is larger than the sum of its proper divisors (20126170070089).

121110111121111 is an frugal number, since it uses more digits than its factorization.

121110111121111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353090702998 (or 353090702984 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 16.

Adding to 121110111121111 its reverse (111121111011121), we get a palindrome (232231222132232).

The spelling of 121110111121111 in words is "one hundred twenty-one trillion, one hundred ten billion, one hundred eleven million, one hundred twenty-one thousand, one hundred eleven".