21326343 has 8 divisors (see below), whose sum is σ = 28518000. Its totient is φ = 14176128.

The previous prime is 21326309. The next prime is 21326351. The reversal of 21326343 is 34362312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21326343 - 2¹⁰ = 21325319 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21326363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9138 + ... + 11231.

It is an arithmetic number, because the mean of its divisors is an integer number (3564750).

Almost surely, 2^21326343 is an apocalyptic number.

21326343 is a deficient number, since it is larger than the sum of its proper divisors (7191657).

21326343 is a wasteful number, since it uses less digits than its factorization.

21326343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20721.

The product of its digits is 2592, while the sum is 24.

The square root of 21326343 is about 4618.0453657365. The cubic root of 21326343 is about 277.3142137658.

Adding to 21326343 its reverse (34362312), we get a palindrome (55688655).

The spelling of 21326343 in words is "twenty-one million, three hundred twenty-six thousand, three hundred forty-three".