12021320000 has 140 divisors (see below), whose sum is σ = 30023904900. Its totient is φ = 4773888000.

The previous prime is 12021319997. The next prime is 12021320011. The reversal of 12021320000 is 2312021.

It is a happy number.

It can be written as a sum of positive squares in 10 ways, for example, as 9511710784 + 2509609216 = 97528^2 + 50096^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5958992 + ... + 5961008.

Almost surely, 2^12021320000 is an apocalyptic number.

12021320000 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 12021320000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15011952450).

12021320000 is an abundant number, since it is smaller than the sum of its proper divisors (18002584900).

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

12021320000 is an equidigital number, since it uses as much as digits as its factorization.

12021320000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2198 (or 2173 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 12021320000 its reverse (2312021), we get a palindrome (12023632021).

The spelling of 12021320000 in words is "twelve billion, twenty-one million, three hundred twenty thousand".