21323322 has 48 divisors (see below), whose sum is σ = 48070152. Its totient is φ = 6825600.

The previous prime is 21323311. The next prime is 21323371. The reversal of 21323322 is 22332312.

It is a happy number.

21323322 is a `hidden beast` number, since 21 + 323 + 322 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 20875761 + 447561 = 4569^2 + 669^2 .

It is a super-2 number, since 2×21323322² = 909368122231368, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 21323295 and 21323304.

It is an unprimeable number.

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, 67108 + ... + 67424.

Almost surely, 2^21323322 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21323322, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24035076).

21323322 is an abundant number, since it is smaller than the sum of its proper divisors (26746830).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21323322 is a wasteful number, since it uses less digits than its factorization.

21323322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463 (or 460 counting only the distinct ones).

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

The square root of 21323322 is about 4617.7182677162. The cubic root of 21323322 is about 277.3011187593.

Adding to 21323322 its reverse (22332312), we get a palindrome (43655634).

The spelling of 21323322 in words is "twenty-one million, three hundred twenty-three thousand, three hundred twenty-two".