121100112111 has 128 divisors (see below), whose sum is σ = 191849720832. Its totient is φ = 67253760000.

The previous prime is 121100112103. The next prime is 121100112121. The reversal of 121100112111 is 111211001121.

It is not a de Polignac number, because 121100112111 - 2³ = 121100112103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121100112121) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 217414645 + ... + 217415201.

It is an arithmetic number, because the mean of its divisors is an integer number (1498825944).

Almost surely, 2^121100112111 is an apocalyptic number.

121100112111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121100112111 is a deficient number, since it is larger than the sum of its proper divisors (70749608721).

121100112111 is a wasteful number, since it uses less digits than its factorization.

121100112111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 793.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 121100112111 its reverse (111211001121), we get a palindrome (232311113232).

It can be divided in two parts, 1211001121 and 11, that multiplied together give a palindrome (13321012331).

The spelling of 121100112111 in words is "one hundred twenty-one billion, one hundred million, one hundred twelve thousand, one hundred eleven".