2189912321 has 2 divisors, whose sum is σ = 2189912322. Its totient is φ = 2189912320.

The previous prime is 2189912297. The next prime is 2189912359. The reversal of 2189912321 is 1232199812.

It is an a-pointer prime, because the next prime (2189912359) can be obtained adding 2189912321 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1220524096 + 969388225 = 34936^2 + 31135^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2189912321 is a prime.

It is not a weakly prime, because it can be changed into another prime (2189917321) 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, 1094956160 + 1094956161.

It is an arithmetic number, because the mean of its divisors is an integer number (1094956161).

Almost surely, 2^2189912321 is an apocalyptic number.

It is an amenable number.

2189912321 is a deficient number, since it is larger than the sum of its proper divisors (1).

2189912321 is an equidigital number, since it uses as much as digits as its factorization.

2189912321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 38.

The square root of 2189912321 is about 46796.4990250339. The cubic root of 2189912321 is about 1298.6005296892.

The spelling of 2189912321 in words is "two billion, one hundred eighty-nine million, nine hundred twelve thousand, three hundred twenty-one".