2331221321 has 32 divisors (see below), whose sum is σ = 2900553600. Its totient is φ = 1852943040.

The previous prime is 2331221317. The next prime is 2331221329. The reversal of 2331221321 is 1231221332.

It is not a de Polignac number, because 2331221321 - 2² = 2331221317 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2331221293 and 2331221302.

It is not an unprimeable number, because it can be changed into a prime (2331221329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 456635 + ... + 461711.

It is an arithmetic number, because the mean of its divisors is an integer number (90642300).

Almost surely, 2^2331221321 is an apocalyptic number.

It is an amenable number.

2331221321 is a deficient number, since it is larger than the sum of its proper divisors (569332279).

2331221321 is a wasteful number, since it uses less digits than its factorization.

2331221321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5146 (or 5120 counting only the distinct ones).

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

The square root of 2331221321 is about 48282.7228001901. The cubic root of 2331221321 is about 1325.9521000254.

Adding to 2331221321 its reverse (1231221332), we get a palindrome (3562442653).

The spelling of 2331221321 in words is "two billion, three hundred thirty-one million, two hundred twenty-one thousand, three hundred twenty-one".