21333343 has 4 divisors (see below), whose sum is σ = 21391840. Its totient is φ = 21274848.

The previous prime is 21333329. The next prime is 21333353. The reversal of 21333343 is 34333312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21333343 - 2¹³ = 21325151 is a prime.

It is a super-2 number, since 2×21333343² = 910223047111298, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21333353) 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 3 ways as a sum of consecutive naturals, for example, 28698 + ... + 29431.

It is an arithmetic number, because the mean of its divisors is an integer number (5347960).

Almost surely, 2^21333343 is an apocalyptic number.

21333343 is a deficient number, since it is larger than the sum of its proper divisors (58497).

21333343 is an equidigital number, since it uses as much as digits as its factorization.

21333343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58496.

The product of its digits is 1944, while the sum is 22.

The square root of 21333343 is about 4618.8031999643. The cubic root of 21333343 is about 277.3445516308.

Adding to 21333343 its reverse (34333312), we get a palindrome (55666655).

It can be divided in two parts, 2133 and 3343, that added together give a square (5476 = 74²).

The spelling of 21333343 in words is "twenty-one million, three hundred thirty-three thousand, three hundred forty-three".