21443323 has 8 divisors (see below), whose sum is σ = 23834736. Its totient is φ = 19125600.

The previous prime is 21443321. The next prime is 21443329. The reversal of 21443323 is 32334412.

It is a happy number.

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 21443323 - 2¹ = 21443321 is a prime.

It is a super-2 number, since 2×21443323² = 919632202564658, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21443294 and 21443303.

It is not an unprimeable number, because it can be changed into a prime (21443321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17808 + ... + 18973.

It is an arithmetic number, because the mean of its divisors is an integer number (2979342).

Almost surely, 2^21443323 is an apocalyptic number.

21443323 is a deficient number, since it is larger than the sum of its proper divisors (2391413).

21443323 is a wasteful number, since it uses less digits than its factorization.

21443323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36845.

The product of its digits is 1728, while the sum is 22.

The square root of 21443323 is about 4630.6935765606. The cubic root of 21443323 is about 277.8203340251.

Adding to 21443323 its reverse (32334412), we get a palindrome (53777735).

It can be divided in two parts, 21 and 443323, that added together give a palindrome (443344).

The spelling of 21443323 in words is "twenty-one million, four hundred forty-three thousand, three hundred twenty-three".