21384235 has 8 divisors (see below), whose sum is σ = 25805520. Its totient is φ = 17011104.

The previous prime is 21384229. The next prime is 21384241. The reversal of 21384235 is 53248312.

It is an interprime number because it is at equal distance from previous prime (21384229) and next prime (21384241).

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

It is a cyclic number.

It is not a de Polignac number, because 21384235 - 2⁹ = 21383723 is a prime.

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, 11052 + ... + 12841.

It is an arithmetic number, because the mean of its divisors is an integer number (3225690).

Almost surely, 2^21384235 is an apocalyptic number.

21384235 is a deficient number, since it is larger than the sum of its proper divisors (4421285).

21384235 is a wasteful number, since it uses less digits than its factorization.

21384235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24077.

The product of its digits is 5760, while the sum is 28.

The square root of 21384235 is about 4624.3091375902. The cubic root of 21384235 is about 277.5649173124.

It can be divided in two parts, 213 and 84235, that added together give a palindrome (84448).

The spelling of 21384235 in words is "twenty-one million, three hundred eighty-four thousand, two hundred thirty-five".