21241424 has 20 divisors (see below), whose sum is σ = 41455680. Its totient is φ = 10543200.

The previous prime is 21241421. The next prime is 21241433. The reversal of 21241424 is 42414212.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 21241396 and 21241405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21241421) 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, 2552 + ... + 6999.

It is an arithmetic number, because the mean of its divisors is an integer number (2072784).

Almost surely, 2^21241424 is an apocalyptic number.

It is an amenable number.

21241424 is a deficient number, since it is larger than the sum of its proper divisors (20214256).

21241424 is a wasteful number, since it uses less digits than its factorization.

21241424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9698 (or 9692 counting only the distinct ones).

The product of its digits is 512, while the sum is 20.

The square root of 21241424 is about 4608.8419369729. The cubic root of 21241424 is about 276.9456465619.

Adding to 21241424 its reverse (42414212), we get a palindrome (63655636).

The spelling of 21241424 in words is "twenty-one million, two hundred forty-one thousand, four hundred twenty-four".