21204333333 has 56 divisors (see below), whose sum is σ = 33147699552. Its totient is φ = 13545893088.

The previous prime is 21204333323. The next prime is 21204333347. The reversal of 21204333333 is 33333340212.

It is a happy number.

It is not a de Polignac number, because 21204333333 - 2⁸ = 21204333077 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

21204333333 is a modest number, since divided by 333333 gives 21204 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 21204333297 and 21204333306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21204333323) 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 55 ways as a sum of consecutive naturals, for example, 1655010 + ... + 1667772.

Almost surely, 2^21204333333 is an apocalyptic number.

It is an amenable number.

21204333333 is a deficient number, since it is larger than the sum of its proper divisors (11943366219).

21204333333 is an equidigital number, since it uses as much as digits as its factorization.

21204333333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12877 (or 12862 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 27.

Adding to 21204333333 its reverse (33333340212), we get a palindrome (54537673545).

The spelling of 21204333333 in words is "twenty-one billion, two hundred four million, three hundred thirty-three thousand, three hundred thirty-three".