121131111 has 4 divisors (see below), whose sum is σ = 161508152. Its totient is φ = 80754072.

The previous prime is 121131077. The next prime is 121131121. The reversal of 121131111 is 111131121.

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

It is not a de Polignac number, because 121131111 - 2⁷ = 121130983 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 (121131121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20188516 + ... + 20188521.

It is an arithmetic number, because the mean of its divisors is an integer number (40377038).

Almost surely, 2^121131111 is an apocalyptic number.

121131111 is a deficient number, since it is larger than the sum of its proper divisors (40377041).

121131111 is an equidigital number, since it uses as much as digits as its factorization.

121131111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40377040.

The product of its digits is 6, while the sum is 12.

The square root of 121131111 is about 11005.9579773866. The cubic root of 121131111 is about 494.7873262495.

Adding to 121131111 its reverse (111131121), we get a palindrome (232262232).

The spelling of 121131111 in words is "one hundred twenty-one million, one hundred thirty-one thousand, one hundred eleven".