12013221321 has 16 divisors (see below), whose sum is σ = 17827001920. Its totient is φ = 7995477600.

The previous prime is 12013221301. The next prime is 12013221331. The reversal of 12013221321 is 12312231021.

12013221321 is a `hidden beast` number, since 1 + 20 + 1 + 322 + 1 + 321 = 666.

It is not a de Polignac number, because 12013221321 - 2²⁵ = 11979666889 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12013221294 and 12013221303.

It is not an unprimeable number, because it can be changed into a prime (12013221301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 353935 + ... + 386388.

It is an arithmetic number, because the mean of its divisors is an integer number (1114187620).

Almost surely, 2^12013221321 is an apocalyptic number.

It is an amenable number.

12013221321 is a deficient number, since it is larger than the sum of its proper divisors (5813780599).

12013221321 is an equidigital number, since it uses as much as digits as its factorization.

12013221321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 740933 (or 740927 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 12013221321 its reverse (12312231021), we get a palindrome (24325452342).

The spelling of 12013221321 in words is "twelve billion, thirteen million, two hundred twenty-one thousand, three hundred twenty-one".