21323534 has 8 divisors (see below), whose sum is σ = 32010600. Its totient is φ = 10653336.

The previous prime is 21323531. The next prime is 21323591. The reversal of 21323534 is 43532312.

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

It is a Curzon number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323531) 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, 344 + ... + 6539.

It is an arithmetic number, because the mean of its divisors is an integer number (4001325).

Almost surely, 2^21323534 is an apocalyptic number.

21323534 is a deficient number, since it is larger than the sum of its proper divisors (10687066).

21323534 is a wasteful number, since it uses less digits than its factorization.

21323534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8434.

The product of its digits is 2160, while the sum is 23.

The square root of 21323534 is about 4617.7412227192. The cubic root of 21323534 is about 277.3020377475.

Adding to 21323534 its reverse (43532312), we get a palindrome (64855846).

The spelling of 21323534 in words is "twenty-one million, three hundred twenty-three thousand, five hundred thirty-four".