21024768 has 104 divisors (see below), whose sum is σ = 58975200. Its totient is φ = 6651904.

The previous prime is 21024761. The next prime is 21024793. The reversal of 21024768 is 86742012.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21024761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 356323 + ... + 356381.

Almost surely, 2^21024768 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 21024768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29487600).

21024768 is an abundant number, since it is smaller than the sum of its proper divisors (37950432).

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

21024768 is an equidigital number, since it uses as much as digits as its factorization.

21024768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115 (or 93 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 21024768 is about 4585.2773089531. The cubic root of 21024768 is about 276.0008401571. Note that the first 3 decimals are identical.

The spelling of 21024768 in words is "twenty-one million, twenty-four thousand, seven hundred sixty-eight".