121101110111 has 16 divisors (see below), whose sum is σ = 127198283520. Its totient is φ = 115075762560.

The previous prime is 121101110101. The next prime is 121101110129. The reversal of 121101110111 is 111011101121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 121101110111 - 2⁶ = 121101110047 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121101110092 and 121101110101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121101110101) 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, 2126375 + ... + 2182583.

It is an arithmetic number, because the mean of its divisors is an integer number (7949892720).

Almost surely, 2^121101110111 is an apocalyptic number.

121101110111 is a deficient number, since it is larger than the sum of its proper divisors (6097173409).

121101110111 is a wasteful number, since it uses less digits than its factorization.

121101110111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56846.

The product of its (nonzero) digits is 2, while the sum is 11.

Adding to 121101110111 its reverse (111011101121), we get a palindrome (232112211232).

It can be divided in two parts, 1 and 21101110111, that added together give a palindrome (21101110112).

The spelling of 121101110111 in words is "one hundred twenty-one billion, one hundred one million, one hundred ten thousand, one hundred eleven".