21343233 has 8 divisors (see below), whose sum is σ = 28488096. Its totient is φ = 14213600.

The previous prime is 21343187. The next prime is 21343243. The reversal of 21343233 is 33234312.

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 21343233 - 2⁹ = 21342721 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21343243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13 + ... + 6533.

It is an arithmetic number, because the mean of its divisors is an integer number (3561012).

Almost surely, 2^21343233 is an apocalyptic number.

It is an amenable number.

21343233 is a deficient number, since it is larger than the sum of its proper divisors (7144863).

21343233 is a wasteful number, since it uses less digits than its factorization.

21343233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7615.

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

The square root of 21343233 is about 4619.8736995723. The cubic root of 21343233 is about 277.3874033904.

Adding to 21343233 its reverse (33234312), we get a palindrome (54577545).

The spelling of 21343233 in words is "twenty-one million, three hundred forty-three thousand, two hundred thirty-three".