12221331321 has 16 divisors (see below), whose sum is σ = 16619665536. Its totient is φ = 7985592576.

The previous prime is 12221331271. The next prime is 12221331341. The reversal of 12221331321 is 12313312221.

It is not a de Polignac number, because 12221331321 - 2¹⁷ = 12221200249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12221331341) 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, 117201 + ... + 195393.

It is an arithmetic number, because the mean of its divisors is an integer number (1038729096).

Almost surely, 2^12221331321 is an apocalyptic number.

It is an amenable number.

12221331321 is a deficient number, since it is larger than the sum of its proper divisors (4398334215).

12221331321 is an equidigital number, since it uses as much as digits as its factorization.

12221331321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79232.

The product of its digits is 432, while the sum is 21.

Adding to 12221331321 its reverse (12313312221), we get a palindrome (24534643542).

The spelling of 12221331321 in words is "twelve billion, two hundred twenty-one million, three hundred thirty-one thousand, three hundred twenty-one".