21334233 has 4 divisors (see below), whose sum is σ = 28445648. Its totient is φ = 14222820.

The previous prime is 21334219. The next prime is 21334241. The reversal of 21334233 is 33243312.

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 not a de Polignac number, because 21334233 - 2⁴ = 21334217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21334213) 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, 3555703 + ... + 3555708.

It is an arithmetic number, because the mean of its divisors is an integer number (7111412).

Almost surely, 2^21334233 is an apocalyptic number.

It is an amenable number.

21334233 is a deficient number, since it is larger than the sum of its proper divisors (7111415).

21334233 is an equidigital number, since it uses as much as digits as its factorization.

21334233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7111414.

The product of its digits is 1296, while the sum is 21.

The square root of 21334233 is about 4618.8995442638. The cubic root of 21334233 is about 277.3484083981.

Adding to 21334233 its reverse (33243312), we get a palindrome (54577545).

The spelling of 21334233 in words is "twenty-one million, three hundred thirty-four thousand, two hundred thirty-three".