21041024 has 32 divisors (see below), whose sum is σ = 42411600. Its totient is φ = 10396672.

The previous prime is 21041011. The next prime is 21041029. The reversal of 21041024 is 42014012.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21041029) 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, 10469 + ... + 12315.

Almost surely, 2^21041024 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 21041024, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21205800).

21041024 is an abundant number, since it is smaller than the sum of its proper divisors (21370576).

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

21041024 is an equidigital number, since it uses as much as digits as its factorization.

21041024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1950 (or 1938 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 21041024 is about 4587.0495964182. The cubic root of 21041024 is about 276.0719549143.

Adding to 21041024 its reverse (42014012), we get a palindrome (63055036).

The spelling of 21041024 in words is "twenty-one million, forty-one thousand, twenty-four".