121512138 has 32 divisors (see below), whose sum is σ = 269084160. Its totient is φ = 36270960.

The previous prime is 121512103. The next prime is 121512173. The reversal of 121512138 is 831215121.

It is an interprime number because it is at equal distance from previous prime (121512103) and next prime (121512173).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 9318 + ... + 18161.

It is an arithmetic number, because the mean of its divisors is an integer number (8408880).

Almost surely, 2^121512138 is an apocalyptic number.

121512138 is an abundant number, since it is smaller than the sum of its proper divisors (147572022).

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

121512138 is a wasteful number, since it uses less digits than its factorization.

121512138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27562.

The product of its digits is 480, while the sum is 24.

The square root of 121512138 is about 11023.2544196349. The cubic root of 121512138 is about 495.3055801154.

Adding to 121512138 its reverse (831215121), we get a palindrome (952727259).

The spelling of 121512138 in words is "one hundred twenty-one million, five hundred twelve thousand, one hundred thirty-eight".