121118111 has 4 divisors (see below), whose sum is σ = 122925912. Its totient is φ = 119310312.

The previous prime is 121118099. The next prime is 121118117. The reversal of 121118111 is 111811121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121118111 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121118111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121118117) 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, 903800 + ... + 903933.

It is an arithmetic number, because the mean of its divisors is an integer number (30731478).

Almost surely, 2^121118111 is an apocalyptic number.

121118111 is a deficient number, since it is larger than the sum of its proper divisors (1807801).

121118111 is an equidigital number, since it uses as much as digits as its factorization.

121118111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1807800.

The product of its digits is 16, while the sum is 17.

The square root of 121118111 is about 11005.3673723325. The cubic root of 121118111 is about 494.7696251395.

Adding to 121118111 its reverse (111811121), we get a palindrome (232929232).

The spelling of 121118111 in words is "one hundred twenty-one million, one hundred eighteen thousand, one hundred eleven".