12121122320 has 20 divisors (see below), whose sum is σ = 28181609580. Its totient is φ = 4848448896.

The previous prime is 12121122317. The next prime is 12121122397. The reversal of 12121122320 is 2322112121.

It can be written as a sum of positive squares in 2 ways, for example, as 2961101056 + 9160021264 = 54416^2 + 95708^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75756935 + ... + 75757094.

It is an arithmetic number, because the mean of its divisors is an integer number (1409080479).

Almost surely, 2^12121122320 is an apocalyptic number.

12121122320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12121122320 is an abundant number, since it is smaller than the sum of its proper divisors (16060487260).

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

12121122320 is a wasteful number, since it uses less digits than its factorization.

12121122320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151514042 (or 151514036 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 12121122320 its reverse (2322112121), we get a palindrome (14443234441).

The spelling of 12121122320 in words is "twelve billion, one hundred twenty-one million, one hundred twenty-two thousand, three hundred twenty".