11421565 has 16 divisors (see below), whose sum is σ = 14572800. Its totient is φ = 8569152.

The previous prime is 11421559. The next prime is 11421577. The reversal of 11421565 is 56512411.

It is a happy number.

It is not a de Polignac number, because 11421565 - 2⁵ = 11421533 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9804 + ... + 10906.

It is an arithmetic number, because the mean of its divisors is an integer number (910800).

Almost surely, 2^11421565 is an apocalyptic number.

It is an amenable number.

11421565 is a deficient number, since it is larger than the sum of its proper divisors (3151235).

11421565 is a wasteful number, since it uses less digits than its factorization.

11421565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1236.

The product of its digits is 1200, while the sum is 25.

The square root of 11421565 is about 3379.5805952810. The cubic root of 11421565 is about 225.2035359895.

Adding to 11421565 its reverse (56512411), we get a palindrome (67933976).

The spelling of 11421565 in words is "eleven million, four hundred twenty-one thousand, five hundred sixty-five".