21024792 has 128 divisors (see below), whose sum is σ = 63360000. Its totient is φ = 6438528.

The previous prime is 21024761. The next prime is 21024793. The reversal of 21024792 is 29742012.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21024793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 192834 + ... + 192942.

It is an arithmetic number, because the mean of its divisors is an integer number (495000).

Almost surely, 2^21024792 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 21024792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31680000).

21024792 is an abundant number, since it is smaller than the sum of its proper divisors (42335208).

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

21024792 is a wasteful number, since it uses less digits than its factorization.

21024792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190 (or 180 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 21024792 is about 4585.2799260241. The cubic root of 21024792 is about 276.0009451763. Note that the first 3 decimals are identical.

The spelling of 21024792 in words is "twenty-one million, twenty-four thousand, seven hundred ninety-two".