21104033 has 2 divisors, whose sum is σ = 21104034. Its totient is φ = 21104032.

The previous prime is 21104029. The next prime is 21104059. The reversal of 21104033 is 33040112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21049744 + 54289 = 4588^2 + 233^2 .

It is a cyclic number.

It is not a de Polignac number, because 21104033 - 2² = 21104029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21103999 and 21104017.

It is not a weakly prime, because it can be changed into another prime (21104063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10552016 + 10552017.

It is an arithmetic number, because the mean of its divisors is an integer number (10552017).

Almost surely, 2^21104033 is an apocalyptic number.

It is an amenable number.

21104033 is a deficient number, since it is larger than the sum of its proper divisors (1).

21104033 is an equidigital number, since it uses as much as digits as its factorization.

21104033 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 21104033 is about 4593.9126025644. The cubic root of 21104033 is about 276.3472533512.

Adding to 21104033 its reverse (33040112), we get a palindrome (54144145).

The spelling of 21104033 in words is "twenty-one million, one hundred four thousand, thirty-three".