12121230320 has 40 divisors (see below), whose sum is σ = 28209652800. Its totient is φ = 4843710720.

The previous prime is 12121230301. The next prime is 12121230371. The reversal of 12121230320 is 2303212121.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7481 + ... + 155879.

It is an arithmetic number, because the mean of its divisors is an integer number (705241320).

Almost surely, 2^12121230320 is an apocalyptic number.

12121230320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12121230320 is an abundant number, since it is smaller than the sum of its proper divisors (16088422480).

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

12121230320 is a wasteful number, since it uses less digits than its factorization.

12121230320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149433 (or 149427 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 12121230320 its reverse (2303212121), we get a palindrome (14424442441).

The spelling of 12121230320 in words is "twelve billion, one hundred twenty-one million, two hundred thirty thousand, three hundred twenty".