12221312320 has 112 divisors (see below), whose sum is σ = 33312689280. Its totient is φ = 4183455744.

The previous prime is 12221312309. The next prime is 12221312351. The reversal of 12221312320 is 2321312221.

It is a tau number, because it is divible by the number of its divisors (112).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1512451 + ... + 1520509.

Almost surely, 2^12221312320 is an apocalyptic number.

12221312320 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 12221312320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16656344640).

12221312320 is an abundant number, since it is smaller than the sum of its proper divisors (21091376960).

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

12221312320 is an equidigital number, since it uses as much as digits as its factorization.

12221312320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8760 (or 8750 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 12221312320 its reverse (2321312221), we get a palindrome (14542624541).

Subtracting from 12221312320 its reverse (2321312221), we obtain a palindrome (9900000099).

The spelling of 12221312320 in words is "twelve billion, two hundred twenty-one million, three hundred twelve thousand, three hundred twenty".