1321143890189 has 2 divisors, whose sum is σ = 1321143890190. Its totient is φ = 1321143890188.

The previous prime is 1321143890159. The next prime is 1321143890237. The reversal of 1321143890189 is 9810983411231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1142510867689 + 178633022500 = 1068883^2 + 422650^2 .

It is an emirp because it is prime and its reverse (9810983411231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1321143890189 - 2⁴⁰ = 221632262413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321143890159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660571945094 + 660571945095.

It is an arithmetic number, because the mean of its divisors is an integer number (660571945095).

Almost surely, 2^{1321143890189} is an apocalyptic number.

It is an amenable number.

1321143890189 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321143890189 is an equidigital number, since it uses as much as digits as its factorization.

1321143890189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 373248, while the sum is 50.

The spelling of 1321143890189 in words is "one trillion, three hundred twenty-one billion, one hundred forty-three million, eight hundred ninety thousand, one hundred eighty-nine".