21843143 has 8 divisors (see below), whose sum is σ = 25146912. Its totient is φ = 18585216.

The previous prime is 21843131. The next prime is 21843167. The reversal of 21843143 is 34134812.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21843143 is a prime.

It is a super-2 number, since 2×21843143² = 954245792236898, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21843043) 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 7 ways as a sum of consecutive naturals, for example, 10430 + ... + 12347.

It is an arithmetic number, because the mean of its divisors is an integer number (3143364).

Almost surely, 2^21843143 is an apocalyptic number.

21843143 is a deficient number, since it is larger than the sum of its proper divisors (3303769).

21843143 is a wasteful number, since it uses less digits than its factorization.

21843143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22921.

The product of its digits is 2304, while the sum is 26.

The square root of 21843143 is about 4673.6648360789. The cubic root of 21843143 is about 279.5364054716.

Adding to 21843143 its reverse (34134812), we get a palindrome (55977955).

The spelling of 21843143 in words is "twenty-one million, eight hundred forty-three thousand, one hundred forty-three".