21104233 has 2 divisors, whose sum is σ = 21104234. Its totient is φ = 21104232.

The previous prime is 21104221. The next prime is 21104243. The reversal of 21104233 is 33240112.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17614809 + 3489424 = 4197^2 + 1868^2 .

It is a cyclic number.

It is not a de Polignac number, because 21104233 - 2⁹ = 21103721 is a prime.

It is not a weakly prime, because it can be changed into another prime (21104203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10552116 + 10552117.

It is an arithmetic number, because the mean of its divisors is an integer number (10552117).

Almost surely, 2^21104233 is an apocalyptic number.

It is an amenable number.

21104233 is a deficient number, since it is larger than the sum of its proper divisors (1).

21104233 is an equidigital number, since it uses as much as digits as its factorization.

21104233 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 21104233 is about 4593.9343704498. The cubic root of 21104233 is about 276.3481263166.

Adding to 21104233 its reverse (33240112), we get a palindrome (54344345).

The spelling of 21104233 in words is "twenty-one million, one hundred four thousand, two hundred thirty-three".