2165362321 has 2 divisors, whose sum is σ = 2165362322. Its totient is φ = 2165362320.

The previous prime is 2165362291. The next prime is 2165362327. The reversal of 2165362321 is 1232635612.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1349460225 + 815902096 = 36735^2 + 28564^2 .

It is a cyclic number.

It is not a de Polignac number, because 2165362321 - 2⁵ = 2165362289 is a prime.

It is not a weakly prime, because it can be changed into another prime (2165362327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1082681160 + 1082681161.

It is an arithmetic number, because the mean of its divisors is an integer number (1082681161).

Almost surely, 2^2165362321 is an apocalyptic number.

It is an amenable number.

2165362321 is a deficient number, since it is larger than the sum of its proper divisors (1).

2165362321 is an equidigital number, since it uses as much as digits as its factorization.

2165362321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 31.

The square root of 2165362321 is about 46533.4537832730. The cubic root of 2165362321 is about 1293.7296310017.

Adding to 2165362321 its reverse (1232635612), we get a palindrome (3397997933).

The spelling of 2165362321 in words is "two billion, one hundred sixty-five million, three hundred sixty-two thousand, three hundred twenty-one".