21116335 has 4 divisors (see below), whose sum is σ = 25339608. Its totient is φ = 16893064.

The previous prime is 21116317. The next prime is 21116351. The reversal of 21116335 is 53361112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21116335 - 2²³ = 12727727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2111629 + ... + 2111638.

It is an arithmetic number, because the mean of its divisors is an integer number (6334902).

Almost surely, 2^21116335 is an apocalyptic number.

21116335 is a deficient number, since it is larger than the sum of its proper divisors (4223273).

21116335 is an equidigital number, since it uses as much as digits as its factorization.

21116335 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4223272.

The product of its digits is 540, while the sum is 22.

The square root of 21116335 is about 4595.2513532994. The cubic root of 21116335 is about 276.4009391965.

Adding to 21116335 its reverse (53361112), we get a palindrome (74477447).

The spelling of 21116335 in words is "twenty-one million, one hundred sixteen thousand, three hundred thirty-five".