21843124 has 12 divisors (see below), whose sum is σ = 38852548. Its totient is φ = 10742400.

The previous prime is 21843121. The next prime is 21843131. The reversal of 21843124 is 42134812.

It can be written as a sum of positive squares in 2 ways, for example, as 1140624 + 20702500 = 1068^2 + 4550^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21843121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44517 + ... + 45004.

Almost surely, 2^21843124 is an apocalyptic number.

It is an amenable number.

21843124 is a deficient number, since it is larger than the sum of its proper divisors (17009424).

21843124 is a wasteful number, since it uses less digits than its factorization.

21843124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89586 (or 89584 counting only the distinct ones).

The product of its digits is 1536, while the sum is 25.

The square root of 21843124 is about 4673.6628034123. The cubic root of 21843124 is about 279.5363244211.

Adding to 21843124 its reverse (42134812), we get a palindrome (63977936).

The spelling of 21843124 in words is "twenty-one million, eight hundred forty-three thousand, one hundred twenty-four".