21324233 has 8 divisors (see below), whose sum is σ = 24679680. Its totient is φ = 18046080.

The previous prime is 21324227. The next prime is 21324253. The reversal of 21324233 is 33242312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21324233 - 2¹⁰ = 21323209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21324203) 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 7 ways as a sum of consecutive naturals, for example, 18728 + ... + 19833.

It is an arithmetic number, because the mean of its divisors is an integer number (3084960).

Almost surely, 2^21324233 is an apocalyptic number.

It is an amenable number.

21324233 is a deficient number, since it is larger than the sum of its proper divisors (3355447).

21324233 is an equidigital number, since it uses as much as digits as its factorization.

21324233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38647.

The product of its digits is 864, while the sum is 20.

The square root of 21324233 is about 4617.8169084536. The cubic root of 21324233 is about 277.3050677644.

Adding to 21324233 its reverse (33242312), we get a palindrome (54566545).

The spelling of 21324233 in words is "twenty-one million, three hundred twenty-four thousand, two hundred thirty-three".