12321321213220 has 72 divisors (see below), whose sum is σ = 27240831592632. Its totient is φ = 4679551918080.

The previous prime is 12321321213217. The next prime is 12321321213269. The reversal of 12321321213220 is 2231212312321.

It can be written as a sum of positive squares in 4 ways, for example, as 1101005306944 + 11220315906276 = 1049288^2 + 3349674^2 .

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, 5029149 + ... + 7066468.

It is an arithmetic number, because the mean of its divisors is an integer number (378344883231).

Almost surely, 2^{12321321213220} is an apocalyptic number.

12321321213220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12321321213220 is an abundant number, since it is smaller than the sum of its proper divisors (14919510379412).

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

12321321213220 is a wasteful number, since it uses less digits than its factorization.

12321321213220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12095741 (or 12095708 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 12321321213220 its reverse (2231212312321), we get a palindrome (14552533525541).

The spelling of 12321321213220 in words is "twelve trillion, three hundred twenty-one billion, three hundred twenty-one million, two hundred thirteen thousand, two hundred twenty".