21324143 has 2 divisors, whose sum is σ = 21324144. Its totient is φ = 21324142.

The previous prime is 21324139. The next prime is 21324161. The reversal of 21324143 is 34142312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21324143 - 2² = 21324139 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21324113) 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 as a sum of consecutive naturals, namely, 10662071 + 10662072.

It is an arithmetic number, because the mean of its divisors is an integer number (10662072).

Almost surely, 2^21324143 is an apocalyptic number.

21324143 is a deficient number, since it is larger than the sum of its proper divisors (1).

21324143 is an equidigital number, since it uses as much as digits as its factorization.

21324143 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 20.

The square root of 21324143 is about 4617.8071635788. The cubic root of 21324143 is about 277.3046776372.

Adding to 21324143 its reverse (34142312), we get a palindrome (55466455).

The spelling of 21324143 in words is "twenty-one million, three hundred twenty-four thousand, one hundred forty-three".