21143124 has 36 divisors (see below), whose sum is σ = 56259840. Its totient is φ = 6676560.

The previous prime is 21143113. The next prime is 21143137. The reversal of 21143124 is 42134112.

21143124 is a `hidden beast` number, since 211 + 431 + 24 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 21143097 and 21143106.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 14772 + ... + 16139.

Almost surely, 2^21143124 is an apocalyptic number.

It is an amenable number.

21143124 is an abundant number, since it is smaller than the sum of its proper divisors (35116716).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21143124 is a wasteful number, since it uses less digits than its factorization.

21143124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30940 (or 30935 counting only the distinct ones).

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

The square root of 21143124 is about 4598.1652862854. The cubic root of 21143124 is about 276.5177741136.

Adding to 21143124 its reverse (42134112), we get a palindrome (63277236).

The spelling of 21143124 in words is "twenty-one million, one hundred forty-three thousand, one hundred twenty-four".