21321333333 has 12 divisors (see below), whose sum is σ = 31001440288. Its totient is φ = 14120087400.

The previous prime is 21321333289. The next prime is 21321333337. The reversal of 21321333333 is 33333312312.

21321333333 is a `hidden beast` number, since 2 + 1 + 321 + 3 + 3 + 3 + 333 = 666.

It is not a de Polignac number, because 21321333333 - 2⁹ = 21321332821 is a prime.

It is a Duffinian number.

21321333333 is a modest number, since divided by 333333 gives 21321 as remainder.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21321333297 and 21321333306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21321333337) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7843135 + ... + 7845852.

Almost surely, 2^21321333333 is an apocalyptic number.

It is an amenable number.

21321333333 is a deficient number, since it is larger than the sum of its proper divisors (9680106955).

21321333333 is a wasteful number, since it uses less digits than its factorization.

21321333333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15689144 (or 15689141 counting only the distinct ones).

The product of its digits is 8748, while the sum is 27.

Adding to 21321333333 its reverse (33333312312), we get a palindrome (54654645645).

The spelling of 21321333333 in words is "twenty-one billion, three hundred twenty-one million, three hundred thirty-three thousand, three hundred thirty-three".