21232330321 has 2 divisors, whose sum is σ = 21232330322. Its totient is φ = 21232330320.

The previous prime is 21232330313. The next prime is 21232330333. The reversal of 21232330321 is 12303323212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19667257600 + 1565072721 = 140240^2 + 39561^2 .

It is a cyclic number.

It is not a de Polignac number, because 21232330321 - 2³ = 21232330313 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21232330292 and 21232330301.

It is not a weakly prime, because it can be changed into another prime (21232330381) 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 as a sum of consecutive naturals, namely, 10616165160 + 10616165161.

It is an arithmetic number, because the mean of its divisors is an integer number (10616165161).

Almost surely, 2^21232330321 is an apocalyptic number.

It is an amenable number.

21232330321 is a deficient number, since it is larger than the sum of its proper divisors (1).

21232330321 is an equidigital number, since it uses as much as digits as its factorization.

21232330321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 21232330321 its reverse (12303323212), we get a palindrome (33535653533).

The spelling of 21232330321 in words is "twenty-one billion, two hundred thirty-two million, three hundred thirty thousand, three hundred twenty-one".