21143323 has 4 divisors (see below), whose sum is σ = 21411040. Its totient is φ = 20875608.

The previous prime is 21143293. The next prime is 21143327. The reversal of 21143323 is 32334112.

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 21143323 - 2⁹ = 21142811 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21143323.

It is not an unprimeable number, because it can be changed into a prime (21143327) 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, 133740 + ... + 133897.

It is an arithmetic number, because the mean of its divisors is an integer number (5352760).

Almost surely, 2^21143323 is an apocalyptic number.

21143323 is a deficient number, since it is larger than the sum of its proper divisors (267717).

21143323 is an equidigital number, since it uses as much as digits as its factorization.

21143323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267716.

The product of its digits is 432, while the sum is 19.

The square root of 21143323 is about 4598.1869253000. The cubic root of 21143323 is about 276.5186416433.

Adding to 21143323 its reverse (32334112), we get a palindrome (53477435).

It can be divided in two parts, 211 and 43323, that added together give a palindrome (43534).

The spelling of 21143323 in words is "twenty-one million, one hundred forty-three thousand, three hundred twenty-three".