21004333 has 8 divisors (see below), whose sum is σ = 25417152. Its totient is φ = 16944576.

The previous prime is 21004331. The next prime is 21004351. The reversal of 21004333 is 33340012.

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 21004333 - 2¹ = 21004331 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21004331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88135 + ... + 88372.

It is an arithmetic number, because the mean of its divisors is an integer number (3177144).

Almost surely, 2^21004333 is an apocalyptic number.

It is an amenable number.

21004333 is a deficient number, since it is larger than the sum of its proper divisors (4412819).

21004333 is a wasteful number, since it uses less digits than its factorization.

21004333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176531.

The product of its (nonzero) digits is 216, while the sum is 16.

The square root of 21004333 is about 4583.0484396305. The cubic root of 21004333 is about 275.9113916006.

Adding to 21004333 its reverse (33340012), we get a palindrome (54344345).

The spelling of 21004333 in words is "twenty-one million, four thousand, three hundred thirty-three".