21435545017 has 2 divisors, whose sum is σ = 21435545018. Its totient is φ = 21435545016.

The previous prime is 21435545009. The next prime is 21435545041. The reversal of 21435545017 is 71054553412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15577785721 + 5857759296 = 124811^2 + 76536^2 .

It is a cyclic number.

It is not a de Polignac number, because 21435545017 - 2³ = 21435545009 is a prime.

It is not a weakly prime, because it can be changed into another prime (21435545317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10717772508 + 10717772509.

It is an arithmetic number, because the mean of its divisors is an integer number (10717772509).

Almost surely, 2^21435545017 is an apocalyptic number.

It is an amenable number.

21435545017 is a deficient number, since it is larger than the sum of its proper divisors (1).

21435545017 is an equidigital number, since it uses as much as digits as its factorization.

21435545017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84000, while the sum is 37.

The spelling of 21435545017 in words is "twenty-one billion, four hundred thirty-five million, five hundred forty-five thousand, seventeen".