16821270289 has 2 divisors, whose sum is σ = 16821270290. Its totient is φ = 16821270288.

The previous prime is 16821270259. The next prime is 16821270377. The reversal of 16821270289 is 98207212861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14457657600 + 2363612689 = 120240^2 + 48617^2 .

It is an emirp because it is prime and its reverse (98207212861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16821270289 - 2⁷ = 16821270161 is a prime.

It is not a weakly prime, because it can be changed into another prime (16821270259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8410635144 + 8410635145.

It is an arithmetic number, because the mean of its divisors is an integer number (8410635145).

Almost surely, 2^16821270289 is an apocalyptic number.

It is an amenable number.

16821270289 is a deficient number, since it is larger than the sum of its proper divisors (1).

16821270289 is an equidigital number, since it uses as much as digits as its factorization.

16821270289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 193536, while the sum is 46.

The spelling of 16821270289 in words is "sixteen billion, eight hundred twenty-one million, two hundred seventy thousand, two hundred eighty-nine".