21338065 has 16 divisors (see below), whose sum is σ = 29818368. Its totient is φ = 14354496.

The previous prime is 21338063. The next prime is 21338099. The reversal of 21338065 is 56083312.

It is a cyclic number.

It is not a de Polignac number, because 21338065 - 2¹ = 21338063 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21338063) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 3897 + ... + 7606.

It is an arithmetic number, because the mean of its divisors is an integer number (1863648).

Almost surely, 2^21338065 is an apocalyptic number.

It is an amenable number.

21338065 is a deficient number, since it is larger than the sum of its proper divisors (8480303).

21338065 is a wasteful number, since it uses less digits than its factorization.

21338065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11568.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 21338065 is about 4619.3143430600. The cubic root of 21338065 is about 277.3650129397.

The spelling of 21338065 in words is "twenty-one million, three hundred thirty-eight thousand, sixty-five".