21024324 has 36 divisors (see below), whose sum is σ = 54862080. Its totient is φ = 6781680.

The previous prime is 21024313. The next prime is 21024331. The reversal of 21024324 is 42342012.

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 junction number, because it is equal to n+sod(n) for n = 21024297 and 21024306.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8304 + ... + 10535.

Almost surely, 2^21024324 is an apocalyptic number.

It is an amenable number.

21024324 is an abundant number, since it is smaller than the sum of its proper divisors (33837756).

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

21024324 is a wasteful number, since it uses less digits than its factorization.

21024324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18880 (or 18875 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 21024324 is about 4585.2288928689. The cubic root of 21024324 is about 275.9988972861.

Adding to 21024324 its reverse (42342012), we get a palindrome (63366336).

The spelling of 21024324 in words is "twenty-one million, twenty-four thousand, three hundred twenty-four".