121242120 has 64 divisors (see below), whose sum is σ = 364849920. Its totient is φ = 32231424.

The previous prime is 121242101. The next prime is 121242137. The reversal of 121242120 is 21242121.

It is a Cunningham number, because it is equal to 11011²-1.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 121242120.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42664 + ... + 45416.

It is an arithmetic number, because the mean of its divisors is an integer number (5700780).

Almost surely, 2^121242120 is an apocalyptic number.

121242120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121242120 is an abundant number, since it is smaller than the sum of its proper divisors (243607800).

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

121242120 is a wasteful number, since it uses less digits than its factorization.

121242120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3134 (or 3130 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 121242120 is about 11010.9999545909. Note that the first 4 decimals coincide. The cubic root of 121242120 is about 494.9384271949.

121242120 divided by its sum of digits (15) gives a palindrome (8082808).

Adding to 121242120 its reverse (21242121), we get a palindrome (142484241).

Subtracting from 121242120 its reverse (21242121), we obtain a palindrome (99999999).

The spelling of 121242120 in words is "one hundred twenty-one million, two hundred forty-two thousand, one hundred twenty".