21332223 has 24 divisors (see below), whose sum is σ = 33860736. Its totient is φ = 12834000.

The previous prime is 21332221. The next prime is 21332251. The reversal of 21332223 is 32223312.

It is a happy number.

It is not a de Polignac number, because 21332223 - 2¹ = 21332221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21332196 and 21332205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21332221) 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 23 ways as a sum of consecutive naturals, for example, 14236 + ... + 15662.

It is an arithmetic number, because the mean of its divisors is an integer number (1410864).

Almost surely, 2^21332223 is an apocalyptic number.

21332223 is a deficient number, since it is larger than the sum of its proper divisors (12528513).

21332223 is a wasteful number, since it uses less digits than its factorization.

21332223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1595 (or 1592 counting only the distinct ones).

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

The square root of 21332223 is about 4618.6819548438. The cubic root of 21332223 is about 277.3396980184.

Adding to 21332223 its reverse (32223312), we get a palindrome (53555535).

It can be divided in two parts, 2133 and 2223, that added together give a square (4356 = 66²).

The spelling of 21332223 in words is "twenty-one million, three hundred thirty-two thousand, two hundred twenty-three".