21104323 has 2 divisors, whose sum is σ = 21104324. Its totient is φ = 21104322.

The previous prime is 21104311. The next prime is 21104329. The reversal of 21104323 is 32340112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21104323 - 2²¹ = 19007171 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21104297 and 21104306.

It is not a weakly prime, because it can be changed into another prime (21104329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10552161 + 10552162.

It is an arithmetic number, because the mean of its divisors is an integer number (10552162).

Almost surely, 2^21104323 is an apocalyptic number.

21104323 is a deficient number, since it is larger than the sum of its proper divisors (1).

21104323 is an equidigital number, since it uses as much as digits as its factorization.

21104323 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 21104323 is about 4593.9441659646. The cubic root of 21104323 is about 276.3485191493.

Adding to 21104323 its reverse (32340112), we get a palindrome (53444435).

The spelling of 21104323 in words is "twenty-one million, one hundred four thousand, three hundred twenty-three".