22005659521 has 2 divisors, whose sum is σ = 22005659522. Its totient is φ = 22005659520.

The previous prime is 22005659513. The next prime is 22005659531. The reversal of 22005659521 is 12595650022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11601659521 + 10404000000 = 107711^2 + 102000^2 .

It is a cyclic number.

It is not a de Polignac number, because 22005659521 - 2³ = 22005659513 is a prime.

It is not a weakly prime, because it can be changed into another prime (22005659531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11002829760 + 11002829761.

It is an arithmetic number, because the mean of its divisors is an integer number (11002829761).

Almost surely, 2^22005659521 is an apocalyptic number.

It is an amenable number.

22005659521 is a deficient number, since it is larger than the sum of its proper divisors (1).

22005659521 is an equidigital number, since it uses as much as digits as its factorization.

22005659521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54000, while the sum is 37.

The spelling of 22005659521 in words is "twenty-two billion, five million, six hundred fifty-nine thousand, five hundred twenty-one".