2221331321 has 16 divisors (see below), whose sum is σ = 2441338368. Its totient is φ = 2004393600.

The previous prime is 2221331317. The next prime is 2221331323. The reversal of 2221331321 is 1231331222.

2221331321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2221331321 - 2² = 2221331317 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2221331293 and 2221331302.

It is not an unprimeable number, because it can be changed into a prime (2221331323) 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, 972701 + ... + 974981.

It is an arithmetic number, because the mean of its divisors is an integer number (152583648).

Almost surely, 2^2221331321 is an apocalyptic number.

It is an amenable number.

2221331321 is a deficient number, since it is larger than the sum of its proper divisors (220007047).

2221331321 is a wasteful number, since it uses less digits than its factorization.

2221331321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2912.

The product of its digits is 432, while the sum is 20.

The square root of 2221331321 is about 47131.0016973966. The cubic root of 2221331321 is about 1304.7814690617.

Adding to 2221331321 its reverse (1231331222), we get a palindrome (3452662543).

Subtracting from 2221331321 its reverse (1231331222), we obtain a palindrome (990000099).

The spelling of 2221331321 in words is "two billion, two hundred twenty-one million, three hundred thirty-one thousand, three hundred twenty-one".