21330003311 has 4 divisors (see below), whose sum is σ = 21380668824. Its totient is φ = 21279337800.

The previous prime is 21330003287. The next prime is 21330003323. The reversal of 21330003311 is 11330003312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21330003311 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21330003311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21330003361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25332125 + ... + 25332966.

It is an arithmetic number, because the mean of its divisors is an integer number (5345167206).

Almost surely, 2^21330003311 is an apocalyptic number.

21330003311 is a deficient number, since it is larger than the sum of its proper divisors (50665513).

21330003311 is an equidigital number, since it uses as much as digits as its factorization.

21330003311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50665512.

The product of its (nonzero) digits is 162, while the sum is 17.

Adding to 21330003311 its reverse (11330003312), we get a palindrome (32660006623).

Subtracting from 21330003311 its reverse (11330003312), we obtain a palindrome (9999999999).

The spelling of 21330003311 in words is "twenty-one billion, three hundred thirty million, three thousand, three hundred eleven".