121112138 has 32 divisors (see below), whose sum is σ = 214216704. Its totient is φ = 50279472.

The previous prime is 121112129. The next prime is 121112171. The reversal of 121112138 is 831211121.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66881 + ... + 68667.

It is an arithmetic number, because the mean of its divisors is an integer number (6694272).

Almost surely, 2^121112138 is an apocalyptic number.

121112138 is a deficient number, since it is larger than the sum of its proper divisors (93104566).

121112138 is a wasteful number, since it uses less digits than its factorization.

121112138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1946.

The product of its digits is 96, while the sum is 20.

The square root of 121112138 is about 11005.0960013986. The cubic root of 121112138 is about 494.7614917356.

Adding to 121112138 its reverse (831211121), we get a palindrome (952323259).

The spelling of 121112138 in words is "one hundred twenty-one million, one hundred twelve thousand, one hundred thirty-eight".