121102211111 has 4 divisors (see below), whose sum is σ = 138402526992. Its totient is φ = 103801895232.

The previous prime is 121102211057. The next prime is 121102211119. The reversal of 121102211111 is 111112201121.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 121102211111 - 2³⁰ = 120028469287 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 (121102211119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8650157930 + ... + 8650157943.

It is an arithmetic number, because the mean of its divisors is an integer number (34600631748).

Almost surely, 2^121102211111 is an apocalyptic number.

121102211111 is a deficient number, since it is larger than the sum of its proper divisors (17300315881).

121102211111 is an equidigital number, since it uses as much as digits as its factorization.

121102211111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17300315880.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 121102211111 its reverse (111112201121), we get a palindrome (232214412232).

The spelling of 121102211111 in words is "one hundred twenty-one billion, one hundred two million, two hundred eleven thousand, one hundred eleven".