21323266 has 8 divisors (see below), whose sum is σ = 32295744. Its totient is φ = 10558020.

The previous prime is 21323261. The next prime is 21323273. The reversal of 21323266 is 66232312.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21323266.

It is not an unprimeable number, because it can be changed into a prime (21323261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51550 + ... + 51961.

It is an arithmetic number, because the mean of its divisors is an integer number (4036968).

Almost surely, 2^21323266 is an apocalyptic number.

21323266 is a deficient number, since it is larger than the sum of its proper divisors (10972478).

21323266 is a wasteful number, since it uses less digits than its factorization.

21323266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103616.

The product of its digits is 2592, while the sum is 25.

The square root of 21323266 is about 4617.7122041115. The cubic root of 21323266 is about 277.3008760067.

Adding to 21323266 its reverse (66232312), we get a palindrome (87555578).

The spelling of 21323266 in words is "twenty-one million, three hundred twenty-three thousand, two hundred sixty-six".