121553120 has 48 divisors (see below), whose sum is σ = 309264480. Its totient is φ = 44880384.

The previous prime is 121553041. The next prime is 121553149. The reversal of 121553120 is 21355121.

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 = 121553092 and 121553101.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 27140 + ... + 31299.

It is an arithmetic number, because the mean of its divisors is an integer number (6443010).

Almost surely, 2^121553120 is an apocalyptic number.

121553120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121553120 is an abundant number, since it is smaller than the sum of its proper divisors (187711360).

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

121553120 is a wasteful number, since it uses less digits than its factorization.

121553120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58467 (or 58459 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 121553120 is about 11025.1131513468. The cubic root of 121553120 is about 495.3612572190.

The spelling of 121553120 in words is "one hundred twenty-one million, five hundred fifty-three thousand, one hundred twenty".