21333104 has 20 divisors (see below), whose sum is σ = 44512776. Its totient is φ = 9845952.

The previous prime is 21333097. The next prime is 21333107. The reversal of 21333104 is 40133312.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21333107) 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, 51074 + ... + 51489.

Almost surely, 2^21333104 is an apocalyptic number.

It is an amenable number.

21333104 is an abundant number, since it is smaller than the sum of its proper divisors (23179672).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21333104 is a wasteful number, since it uses less digits than its factorization.

21333104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102584 (or 102578 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 21333104 is about 4618.7773273887. Note that the first 3 decimals coincide. The cubic root of 21333104 is about 277.3435159189.

Adding to 21333104 its reverse (40133312), we get a palindrome (61466416).

The spelling of 21333104 in words is "twenty-one million, three hundred thirty-three thousand, one hundred four".