16821814489 has 2 divisors, whose sum is σ = 16821814490. Its totient is φ = 16821814488.

The previous prime is 16821814463. The next prime is 16821814567. The reversal of 16821814489 is 98441812861.

16821814489 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12948619264 + 3873195225 = 113792^2 + 62235^2 .

It is a cyclic number.

It is not a de Polignac number, because 16821814489 - 2¹³ = 16821806297 is a prime.

It is a super-2 number, since 2×16821814489² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16821814409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8410907244 + 8410907245.

It is an arithmetic number, because the mean of its divisors is an integer number (8410907245).

Almost surely, 2^16821814489 is an apocalyptic number.

It is an amenable number.

16821814489 is a deficient number, since it is larger than the sum of its proper divisors (1).

16821814489 is an equidigital number, since it uses as much as digits as its factorization.

16821814489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 884736, while the sum is 52.

The spelling of 16821814489 in words is "sixteen billion, eight hundred twenty-one million, eight hundred fourteen thousand, four hundred eighty-nine".