21124143 has 48 divisors (see below), whose sum is σ = 34594560. Its totient is φ = 12355200.

The previous prime is 21124141. The next prime is 21124163. The reversal of 21124143 is 34142112.

It is not a de Polignac number, because 21124143 - 2¹ = 21124141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21124141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 161188 + ... + 161318.

It is an arithmetic number, because the mean of its divisors is an integer number (720720).

Almost surely, 2^21124143 is an apocalyptic number.

21124143 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21124143 is a deficient number, since it is larger than the sum of its proper divisors (13470417).

21124143 is a wasteful number, since it uses less digits than its factorization.

21124143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220 (or 217 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 21124143 is about 4596.1008474575. The cubic root of 21124143 is about 276.4350024401.

Adding to 21124143 its reverse (34142112), we get a palindrome (55266255).

The spelling of 21124143 in words is "twenty-one million, one hundred twenty-four thousand, one hundred forty-three".