11989321 has 2 divisors, whose sum is σ = 11989322. Its totient is φ = 11989320.

The previous prime is 11989319. The next prime is 11989333. The reversal of 11989321 is 12398911.

11989321 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11799225 + 190096 = 3435^2 + 436^2 .

It is a cyclic number.

It is not a de Polignac number, because 11989321 - 2¹ = 11989319 is a prime.

Together with 11989319, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (11989121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5994660 + 5994661.

It is an arithmetic number, because the mean of its divisors is an integer number (5994661).

Almost surely, 2^11989321 is an apocalyptic number.

It is an amenable number.

11989321 is a deficient number, since it is larger than the sum of its proper divisors (1).

11989321 is an equidigital number, since it uses as much as digits as its factorization.

11989321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 34.

The square root of 11989321 is about 3462.5598911788. The cubic root of 11989321 is about 228.8749150028.

The spelling of 11989321 in words is "eleven million, nine hundred eighty-nine thousand, three hundred twenty-one".