2189645321 has 2 divisors, whose sum is σ = 2189645322. Its totient is φ = 2189645320.

The previous prime is 2189645317. The next prime is 2189645363. The reversal of 2189645321 is 1235469812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1293481225 + 896164096 = 35965^2 + 29936^2 .

It is a cyclic number.

It is not a de Polignac number, because 2189645321 - 2² = 2189645317 is a prime.

It is not a weakly prime, because it can be changed into another prime (2189645371) 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, 1094822660 + 1094822661.

It is an arithmetic number, because the mean of its divisors is an integer number (1094822661).

Almost surely, 2^2189645321 is an apocalyptic number.

It is an amenable number.

2189645321 is a deficient number, since it is larger than the sum of its proper divisors (1).

2189645321 is an equidigital number, since it uses as much as digits as its factorization.

2189645321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 41.

The square root of 2189645321 is about 46793.6461605633. The cubic root of 2189645321 is about 1298.5477512544.

The spelling of 2189645321 in words is "two billion, one hundred eighty-nine million, six hundred forty-five thousand, three hundred twenty-one".