121520224 has 96 divisors (see below), whose sum is σ = 289336320. Its totient is φ = 49116672.

The previous prime is 121520197. The next prime is 121520227. The reversal of 121520224 is 422025121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121520227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 530542 + ... + 530770.

It is an arithmetic number, because the mean of its divisors is an integer number (3013920).

Almost surely, 2^121520224 is an apocalyptic number.

121520224 is a gapful number since it is divisible by the number (14) 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 121520224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (144668160).

121520224 is an abundant number, since it is smaller than the sum of its proper divisors (167816096).

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

121520224 is a wasteful number, since it uses less digits than its factorization.

121520224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372 (or 364 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 121520224 is about 11023.6211836220. The cubic root of 121520224 is about 495.3165665407.

Adding to 121520224 its reverse (422025121), we get a palindrome (543545345).

The spelling of 121520224 in words is "one hundred twenty-one million, five hundred twenty thousand, two hundred twenty-four".