121232320 has 168 divisors, whose sum is σ = 330793344. Its totient is φ = 42240000.

The previous prime is 121232311. The next prime is 121232347. The reversal of 121232320 is 23232121.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 121232294 and 121232303.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1200270 + ... + 1200370.

It is an arithmetic number, because the mean of its divisors is an integer number (1969008).

Almost surely, 2^121232320 is an apocalyptic number.

121232320 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 121232320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (165396672).

121232320 is an abundant number, since it is smaller than the sum of its proper divisors (209561024).

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

121232320 is a wasteful number, since it uses less digits than its factorization.

121232320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171 (or 150 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 121232320 is about 11010.5549360602. The cubic root of 121232320 is about 494.9250915453.

Adding to 121232320 its reverse (23232121), we get a palindrome (144464441).

The spelling of 121232320 in words is "one hundred twenty-one million, two hundred thirty-two thousand, three hundred twenty".