21024032 has 48 divisors (see below), whose sum is σ = 44049600. Its totient is φ = 9849600.

The previous prime is 21023971. The next prime is 21024067. The reversal of 21024032 is 23042012.

It is a junction number, because it is equal to n+sod(n) for n = 21023998 and 21024016.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91694 + ... + 91922.

It is an arithmetic number, because the mean of its divisors is an integer number (917700).

Almost surely, 2^21024032 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21024032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22024800).

21024032 is an abundant number, since it is smaller than the sum of its proper divisors (23025568).

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

21024032 is a wasteful number, since it uses less digits than its factorization.

21024032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409 (or 401 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 21024032 is about 4585.1970513818. The cubic root of 21024032 is about 275.9976195272.

Adding to 21024032 its reverse (23042012), we get a palindrome (44066044).

It can be divided in two parts, 210 and 24032, that added together give a palindrome (24242).

The spelling of 21024032 in words is "twenty-one million, twenty-four thousand, thirty-two".