21363343 has 8 divisors (see below), whose sum is σ = 23061600. Its totient is φ = 19729248.

The previous prime is 21363323. The next prime is 21363347. The reversal of 21363343 is 34336312.

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 21363343 - 2⁵ = 21363311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21363347) 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, 15348 + ... + 16681.

It is an arithmetic number, because the mean of its divisors is an integer number (2882700).

Almost surely, 2^21363343 is an apocalyptic number.

21363343 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21363343 is a deficient number, since it is larger than the sum of its proper divisors (1698257).

21363343 is a wasteful number, since it uses less digits than its factorization.

21363343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32081.

The product of its digits is 3888, while the sum is 25.

The square root of 21363343 is about 4622.0496535628. The cubic root of 21363343 is about 277.4744959381.

Adding to 21363343 its reverse (34336312), we get a palindrome (55699655).

The spelling of 21363343 in words is "twenty-one million, three hundred sixty-three thousand, three hundred forty-three".