12213565 has 32 divisors (see below), whose sum is σ = 19111680. Its totient is φ = 7271424.

The previous prime is 12213541. The next prime is 12213571. The reversal of 12213565 is 56531221.

It is a cyclic number.

It is not a de Polignac number, because 12213565 - 2⁹ = 12213053 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6946 + ... + 8524.

It is an arithmetic number, because the mean of its divisors is an integer number (597240).

Almost surely, 2^12213565 is an apocalyptic number.

It is an amenable number.

12213565 is a deficient number, since it is larger than the sum of its proper divisors (6898115).

12213565 is a wasteful number, since it uses less digits than its factorization.

12213565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1621.

The product of its digits is 1800, while the sum is 25.

The square root of 12213565 is about 3494.7911239443. The cubic root of 12213565 is about 230.2930417275.

Adding to 12213565 its reverse (56531221), we get a palindrome (68744786).

The spelling of 12213565 in words is "twelve million, two hundred thirteen thousand, five hundred sixty-five".