21110233 has 2 divisors, whose sum is σ = 21110234. Its totient is φ = 21110232.

The previous prime is 21110227. The next prime is 21110249. The reversal of 21110233 is 33201112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16257024 + 4853209 = 4032^2 + 2203^2 .

It is a cyclic number.

It is not a de Polignac number, because 21110233 - 2²¹ = 19013081 is a prime.

It is not a weakly prime, because it can be changed into another prime (21110263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555116 + 10555117.

It is an arithmetic number, because the mean of its divisors is an integer number (10555117).

Almost surely, 2^21110233 is an apocalyptic number.

It is an amenable number.

21110233 is a deficient number, since it is larger than the sum of its proper divisors (1).

21110233 is an equidigital number, since it uses as much as digits as its factorization.

21110233 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 21110233 is about 4594.5873590563. The cubic root of 21110233 is about 276.3743127165.

Adding to 21110233 its reverse (33201112), we get a palindrome (54311345).

The spelling of 21110233 in words is "twenty-one million, one hundred ten thousand, two hundred thirty-three".