321440212189 has 2 divisors, whose sum is σ = 321440212190. Its totient is φ = 321440212188.

The previous prime is 321440212187. The next prime is 321440212199. The reversal of 321440212189 is 981212044123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 286604976025 + 34835236164 = 535355^2 + 186642^2 .

It is an emirp because it is prime and its reverse (981212044123) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 321440212189 - 2¹ = 321440212187 is a prime.

Together with 321440212187, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321440212187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160720106094 + 160720106095.

It is an arithmetic number, because the mean of its divisors is an integer number (160720106095).

Almost surely, 2^321440212189 is an apocalyptic number.

It is an amenable number.

321440212189 is a deficient number, since it is larger than the sum of its proper divisors (1).

321440212189 is an equidigital number, since it uses as much as digits as its factorization.

321440212189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27648, while the sum is 37.

The spelling of 321440212189 in words is "three hundred twenty-one billion, four hundred forty million, two hundred twelve thousand, one hundred eighty-nine".