21214065 has 16 divisors (see below), whose sum is σ = 34080768. Its totient is φ = 11268096.

The previous prime is 21214049. The next prime is 21214087. The reversal of 21214065 is 56041212.

It is not a de Polignac number, because 21214065 - 2⁴ = 21214049 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 1104 + ... + 6606.

It is an arithmetic number, because the mean of its divisors is an integer number (2130048).

Almost surely, 2^21214065 is an apocalyptic number.

It is an amenable number.

21214065 is a deficient number, since it is larger than the sum of its proper divisors (12866703).

21214065 is a wasteful number, since it uses less digits than its factorization.

21214065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5768.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 21214065 is about 4605.8728814417. The cubic root of 21214065 is about 276.8266932795.

Adding to 21214065 its reverse (56041212), we get a palindrome (77255277).

The spelling of 21214065 in words is "twenty-one million, two hundred fourteen thousand, sixty-five".