21323233 has 4 divisors (see below), whose sum is σ = 21364528. Its totient is φ = 21281940.

The previous prime is 21323209. The next prime is 21323261. The reversal of 21323233 is 33232312.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21323233 - 2¹⁷ = 21192161 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21323233.

It is not an unprimeable number, because it can be changed into a prime (21323273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19863 + ... + 20908.

It is an arithmetic number, because the mean of its divisors is an integer number (5341132).

Almost surely, 2^21323233 is an apocalyptic number.

It is an amenable number.

21323233 is a deficient number, since it is larger than the sum of its proper divisors (41295).

21323233 is an equidigital number, since it uses as much as digits as its factorization.

21323233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41294.

The product of its digits is 648, while the sum is 19.

The square root of 21323233 is about 4617.7086309121. The cubic root of 21323233 is about 277.3007329558.

Adding to 21323233 its reverse (33232312), we get a palindrome (54555545).

The spelling of 21323233 in words is "twenty-one million, three hundred twenty-three thousand, two hundred thirty-three".