21104333 has 2 divisors, whose sum is σ = 21104334. Its totient is φ = 21104332.

The previous prime is 21104329. The next prime is 21104339. The reversal of 21104333 is 33340112.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17156164 + 3948169 = 4142^2 + 1987^2 .

It is a cyclic number.

It is not a de Polignac number, because 21104333 - 2² = 21104329 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21104339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10552166 + 10552167.

It is an arithmetic number, because the mean of its divisors is an integer number (10552167).

Almost surely, 2^21104333 is an apocalyptic number.

It is an amenable number.

21104333 is a deficient number, since it is larger than the sum of its proper divisors (1).

21104333 is an equidigital number, since it uses as much as digits as its factorization.

21104333 is an evil number, because the sum of its binary digits is even.

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

The square root of 21104333 is about 4593.9452543538. The cubic root of 21104333 is about 276.3485627973.

Adding to 21104333 its reverse (33340112), we get a palindrome (54444445).

The spelling of 21104333 in words is "twenty-one million, one hundred four thousand, three hundred thirty-three".