21032233 has 4 divisors (see below), whose sum is σ = 21041620. Its totient is φ = 21022848.

The previous prime is 21032201. The next prime is 21032237. The reversal of 21032233 is 33223012.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 11471769 + 9560464 = 3387^2 + 3092^2 .

It is a cyclic number.

It is not a de Polignac number, because 21032233 - 2⁵ = 21032201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21032237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 853 + ... + 6541.

It is an arithmetic number, because the mean of its divisors is an integer number (5260405).

Almost surely, 2^21032233 is an apocalyptic number.

It is an amenable number.

21032233 is a deficient number, since it is larger than the sum of its proper divisors (9387).

21032233 is an equidigital number, since it uses as much as digits as its factorization.

21032233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9386.

The product of its (nonzero) digits is 216, while the sum is 16.

The square root of 21032233 is about 4586.0912550886. The cubic root of 21032233 is about 276.0335016744.

Adding to 21032233 its reverse (33223012), we get a palindrome (54255245).

The spelling of 21032233 in words is "twenty-one million, thirty-two thousand, two hundred thirty-three".