21135065 has 8 divisors (see below), whose sum is σ = 28985280. Its totient is φ = 14492592.

The previous prime is 21135053. The next prime is 21135071. The reversal of 21135065 is 56053112.

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 21135065 - 2⁶ = 21135001 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21135065.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 301895 + ... + 301964.

It is an arithmetic number, because the mean of its divisors is an integer number (3623160).

Almost surely, 2^21135065 is an apocalyptic number.

It is an amenable number.

21135065 is a deficient number, since it is larger than the sum of its proper divisors (7850215).

21135065 is an equidigital number, since it uses as much as digits as its factorization.

21135065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603871.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 21135065 is about 4597.2888749784. The cubic root of 21135065 is about 276.4826367653.

Adding to 21135065 its reverse (56053112), we get a palindrome (77188177).

The spelling of 21135065 in words is "twenty-one million, one hundred thirty-five thousand, sixty-five".