21335765009 has 8 divisors (see below), whose sum is σ = 23465850240. Its totient is φ = 19275518736.

The previous prime is 21335764999. The next prime is 21335765027. The reversal of 21335765009 is 90056753312.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21335765009 - 2¹² = 21335760913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21335765039) 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 in 7 ways as a sum of consecutive naturals, for example, 17459099 + ... + 17460320.

It is an arithmetic number, because the mean of its divisors is an integer number (2933231280).

Almost surely, 2^21335765009 is an apocalyptic number.

It is an amenable number.

21335765009 is a deficient number, since it is larger than the sum of its proper divisors (2130085231).

21335765009 is a wasteful number, since it uses less digits than its factorization.

21335765009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34919479.

The product of its (nonzero) digits is 170100, while the sum is 41.

The spelling of 21335765009 in words is "twenty-one billion, three hundred thirty-five million, seven hundred sixty-five thousand, nine".