21233223 has 24 divisors (see below), whose sum is σ = 33720960. Its totient is φ = 12767760.

The previous prime is 21233213. The next prime is 21233239. The reversal of 21233223 is 32233212.

It is a happy number.

It is not a de Polignac number, because 21233223 - 2¹⁰ = 21232199 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21233196 and 21233205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21233213) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12990 + ... + 14532.

It is an arithmetic number, because the mean of its divisors is an integer number (1405040).

Almost surely, 2^21233223 is an apocalyptic number.

21233223 is a deficient number, since it is larger than the sum of its proper divisors (12487737).

21233223 is a wasteful number, since it uses less digits than its factorization.

21233223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1699 (or 1696 counting only the distinct ones).

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

The square root of 21233223 is about 4607.9521481890. The cubic root of 21233223 is about 276.9100004331.

Adding to 21233223 its reverse (32233212), we get a palindrome (53466435).

The spelling of 21233223 in words is "twenty-one million, two hundred thirty-three thousand, two hundred twenty-three".