24000021 has 12 divisors (see below), whose sum is σ = 36491520. Its totient is φ = 15157800.

The previous prime is 24000019. The next prime is 24000037. The reversal of 24000021 is 12000042.

It is not a de Polignac number, because 24000021 - 2¹ = 24000019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 23999967 and 24000012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (24000001) 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 11 ways as a sum of consecutive naturals, for example, 70005 + ... + 70346.

It is an arithmetic number, because the mean of its divisors is an integer number (3040960).

Almost surely, 2^24000021 is an apocalyptic number.

It is an amenable number.

24000021 is a deficient number, since it is larger than the sum of its proper divisors (12491499).

24000021 is a wasteful number, since it uses less digits than its factorization.

24000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140376 (or 140373 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 24000021 is about 4898.9816288694. The cubic root of 24000021 is about 288.4499981927.

Adding to 24000021 its reverse (12000042), we get a palindrome (36000063).

The spelling of 24000021 in words is "twenty-four million, twenty-one", and thus it is an aban number.