21223323 has 32 divisors (see below), whose sum is σ = 36115200. Its totient is φ = 12182400.

The previous prime is 21223297. The next prime is 21223333. The reversal of 21223323 is 32332212.

It is a happy number.

It is not a de Polignac number, because 21223323 - 2⁵ = 21223291 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21223296 and 21223305.

It is not an unprimeable number, because it can be changed into a prime (21223333) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3763 + ... + 7523.

It is an arithmetic number, because the mean of its divisors is an integer number (1128600).

Almost surely, 2^21223323 is an apocalyptic number.

21223323 is a deficient number, since it is larger than the sum of its proper divisors (14891877).

21223323 is a wasteful number, since it uses less digits than its factorization.

21223323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3800 (or 3794 counting only the distinct ones).

The product of its digits is 432, while the sum is 18.

The square root of 21223323 is about 4606.8777930394. The cubic root of 21223323 is about 276.8669572710.

Adding to 21223323 its reverse (32332212), we get a palindrome (53555535).

Subtracting 21223323 from its reverse (32332212), we obtain a square (11108889 = 3333²).

It can be divided in two parts, 2122 and 3323, that added together give a palindrome (5445).

The spelling of 21223323 in words is "twenty-one million, two hundred twenty-three thousand, three hundred twenty-three".