21335242 has 8 divisors (see below), whose sum is σ = 33106500. Its totient is φ = 10299744.

The previous prime is 21335231. The next prime is 21335257. The reversal of 21335242 is 24253312.

It can be written as a sum of positive squares in 2 ways, for example, as 21335161 + 81 = 4619^2 + 9^2 .

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

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 3 ways as a sum of consecutive naturals, for example, 183867 + ... + 183982.

Almost surely, 2^21335242 is an apocalyptic number.

21335242 is a deficient number, since it is larger than the sum of its proper divisors (11771258).

21335242 is a wasteful number, since it uses less digits than its factorization.

21335242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367880.

The product of its digits is 1440, while the sum is 22.

The square root of 21335242 is about 4619.0087681233. The cubic root of 21335242 is about 277.3527807158.

Adding to 21335242 its reverse (24253312), we get a palindrome (45588554).

The spelling of 21335242 in words is "twenty-one million, three hundred thirty-five thousand, two hundred forty-two".