121554720 has 288 divisors, whose sum is σ = 490613760. Its totient is φ = 26818560.

The previous prime is 121554703. The next prime is 121554721. The reversal of 121554720 is 27455121.

It is a tau number, because it is divible by the number of its divisors (288).

It is not an unprimeable number, because it can be changed into a prime (121554721) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 312286 + ... + 312674.

It is an arithmetic number, because the mean of its divisors is an integer number (1703520).

Almost surely, 2^121554720 is an apocalyptic number.

121554720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121554720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (245306880).

121554720 is an abundant number, since it is smaller than the sum of its proper divisors (369059040).

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

121554720 is a wasteful number, since it uses less digits than its factorization.

121554720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448 (or 437 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 27.

The square root of 121554720 is about 11025.1857127216. The cubic root of 121554720 is about 495.3634306845.

The spelling of 121554720 in words is "one hundred twenty-one million, five hundred fifty-four thousand, seven hundred twenty".