21241235 has 8 divisors (see below), whose sum is σ = 25532016. Its totient is φ = 16964640.

The previous prime is 21241229. The next prime is 21241247. The reversal of 21241235 is 53214212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21241235 - 2¹⁰ = 21240211 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 92 + ... + 6518.

It is an arithmetic number, because the mean of its divisors is an integer number (3191502).

Almost surely, 2^21241235 is an apocalyptic number.

21241235 is a deficient number, since it is larger than the sum of its proper divisors (4290781).

21241235 is an equidigital number, since it uses as much as digits as its factorization.

21241235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7093.

The product of its digits is 480, while the sum is 20.

The square root of 21241235 is about 4608.8214328611. The cubic root of 21241235 is about 276.9448251656.

Adding to 21241235 its reverse (53214212), we get a palindrome (74455447).

The spelling of 21241235 in words is "twenty-one million, two hundred forty-one thousand, two hundred thirty-five".