2121331321 has 2 divisors, whose sum is σ = 2121331322. Its totient is φ = 2121331320.

The previous prime is 2121331301. The next prime is 2121331337. The reversal of 2121331321 is 1231331212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1974558096 + 146773225 = 44436^2 + 12115^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121331321 is a prime.

It is not a weakly prime, because it can be changed into another prime (2121331301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060665660 + 1060665661.

It is an arithmetic number, because the mean of its divisors is an integer number (1060665661).

Almost surely, 2^2121331321 is an apocalyptic number.

It is an amenable number.

2121331321 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121331321 is an equidigital number, since it uses as much as digits as its factorization.

2121331321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216, while the sum is 19.

The square root of 2121331321 is about 46057.9126860955. The cubic root of 2121331321 is about 1284.9005097918.

Adding to 2121331321 its reverse (1231331212), we get a palindrome (3352662533).

The spelling of 2121331321 in words is "two billion, one hundred twenty-one million, three hundred thirty-one thousand, three hundred twenty-one".