21414565 has 8 divisors (see below), whose sum is σ = 25732728. Its totient is φ = 17108160.

The previous prime is 21414551. The next prime is 21414571. The reversal of 21414565 is 56541412.

It can be written as a sum of positive squares in 4 ways, for example, as 1718721 + 19695844 = 1311^2 + 4438^2 .

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

It is not a de Polignac number, because 21414565 - 2⁹ = 21414053 is a prime.

It is an alternating number because its digits alternate between even and odd.

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 (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1755 + ... + 6775.

It is an arithmetic number, because the mean of its divisors is an integer number (3216591).

Almost surely, 2^21414565 is an apocalyptic number.

It is an amenable number.

21414565 is a deficient number, since it is larger than the sum of its proper divisors (4318163).

21414565 is an equidigital number, since it uses as much as digits as its factorization.

21414565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5879.

The product of its digits is 4800, while the sum is 28.

The square root of 21414565 is about 4627.5873843721. The cubic root of 21414565 is about 277.6960819604.

Adding to 21414565 its reverse (56541412), we get a palindrome (77955977).

The spelling of 21414565 in words is "twenty-one million, four hundred fourteen thousand, five hundred sixty-five".