21833566009 has 2 divisors, whose sum is σ = 21833566010. Its totient is φ = 21833566008.

The previous prime is 21833566003. The next prime is 21833566039. The reversal of 21833566009 is 90066533812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15568051984 + 6265514025 = 124772^2 + 79155^2 .

It is a cyclic number.

It is not a de Polignac number, because 21833566009 - 2¹³ = 21833557817 is a prime.

It is not a weakly prime, because it can be changed into another prime (21833566003) 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, 10916783004 + 10916783005.

It is an arithmetic number, because the mean of its divisors is an integer number (10916783005).

Almost surely, 2^21833566009 is an apocalyptic number.

It is an amenable number.

21833566009 is a deficient number, since it is larger than the sum of its proper divisors (1).

21833566009 is an equidigital number, since it uses as much as digits as its factorization.

21833566009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 233280, while the sum is 43.

The spelling of 21833566009 in words is "twenty-one billion, eight hundred thirty-three million, five hundred sixty-six thousand, nine".