121544120 has 32 divisors (see below), whose sum is σ = 276138720. Its totient is φ = 48144000.

The previous prime is 121544099. The next prime is 121544123. The reversal of 121544120 is 21445121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 121544092 and 121544101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121544123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10631 + ... + 18870.

It is an arithmetic number, because the mean of its divisors is an integer number (8629335).

Almost surely, 2^121544120 is an apocalyptic number.

121544120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121544120 is an abundant number, since it is smaller than the sum of its proper divisors (154594600).

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

121544120 is a wasteful number, since it uses less digits than its factorization.

121544120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29615 (or 29611 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 121544120 is about 11024.7049847150. The cubic root of 121544120 is about 495.3490311203.

Adding to 121544120 its reverse (21445121), we get a palindrome (142989241).

The spelling of 121544120 in words is "one hundred twenty-one million, five hundred forty-four thousand, one hundred twenty".