121110138 has 48 divisors (see below), whose sum is σ = 268085376. Its totient is φ = 39504960.

The previous prime is 121110137. The next prime is 121110163. The reversal of 121110138 is 831011121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a self number, because there is not a number n which added to its sum of digits gives 121110138.

It is not an unprimeable number, because it can be changed into a prime (121110137) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 280783 + ... + 281213.

It is an arithmetic number, because the mean of its divisors is an integer number (5585112).

Almost surely, 2^121110138 is an apocalyptic number.

121110138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

121110138 is an abundant number, since it is smaller than the sum of its proper divisors (146975238).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121110138 is a wasteful number, since it uses less digits than its factorization.

121110138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 739 (or 736 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

The square root of 121110138 is about 11005.0051340288. The cubic root of 121110138 is about 494.7587682860.

Adding to 121110138 its reverse (831011121), we get a palindrome (952121259).

The spelling of 121110138 in words is "one hundred twenty-one million, one hundred ten thousand, one hundred thirty-eight".