21183648389 has 2 divisors, whose sum is σ = 21183648390. Its totient is φ = 21183648388.

The previous prime is 21183648341. The next prime is 21183648449. The reversal of 21183648389 is 98384638112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17681020900 + 3502627489 = 132970^2 + 59183^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21183648389 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21183648389.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21183648089) 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, 10591824194 + 10591824195.

It is an arithmetic number, because the mean of its divisors is an integer number (10591824195).

Almost surely, 2^21183648389 is an apocalyptic number.

It is an amenable number.

21183648389 is a deficient number, since it is larger than the sum of its proper divisors (1).

21183648389 is an equidigital number, since it uses as much as digits as its factorization.

21183648389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1990656, while the sum is 53.

The spelling of 21183648389 in words is "twenty-one billion, one hundred eighty-three million, six hundred forty-eight thousand, three hundred eighty-nine".