19821328433 has 2 divisors, whose sum is σ = 19821328434. Its totient is φ = 19821328432.

The previous prime is 19821328427. The next prime is 19821328459. The reversal of 19821328433 is 33482312891.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18396039424 + 1425289009 = 135632^2 + 37753^2 .

It is an emirp because it is prime and its reverse (33482312891) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19821328433 is a prime.

It is not a weakly prime, because it can be changed into another prime (19821324433) 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, 9910664216 + 9910664217.

It is an arithmetic number, because the mean of its divisors is an integer number (9910664217).

Almost surely, 2^19821328433 is an apocalyptic number.

It is an amenable number.

19821328433 is a deficient number, since it is larger than the sum of its proper divisors (1).

19821328433 is an equidigital number, since it uses as much as digits as its factorization.

19821328433 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 44.

The spelling of 19821328433 in words is "nineteen billion, eight hundred twenty-one million, three hundred twenty-eight thousand, four hundred thirty-three".