21326223 has 8 divisors (see below), whose sum is σ = 29415600. Its totient is φ = 13727168.

The previous prime is 21326219. The next prime is 21326231. The reversal of 21326223 is 32262312.

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 21326223 - 2² = 21326219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21326223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21326213) 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 7 ways as a sum of consecutive naturals, for example, 122478 + ... + 122651.

It is an arithmetic number, because the mean of its divisors is an integer number (3676950).

Almost surely, 2^21326223 is an apocalyptic number.

21326223 is a deficient number, since it is larger than the sum of its proper divisors (8089377).

21326223 is a wasteful number, since it uses less digits than its factorization.

21326223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245161.

The product of its digits is 864, while the sum is 21.

The square root of 21326223 is about 4618.0323732083. The cubic root of 21326223 is about 277.3136936302.

Adding to 21326223 its reverse (32262312), we get a palindrome (53588535).

The spelling of 21326223 in words is "twenty-one million, three hundred twenty-six thousand, two hundred twenty-three".