12421006565 has 32 divisors (see below), whose sum is σ = 17508597120. Its totient is φ = 8357939200.

The previous prime is 12421006529. The next prime is 12421006573. The reversal of 12421006565 is 56560012421.

It is not a de Polignac number, because 12421006565 - 2¹⁴ = 12420990181 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, 57416 + ... + 167745.

It is an arithmetic number, because the mean of its divisors is an integer number (547143660).

Almost surely, 2^12421006565 is an apocalyptic number.

It is an amenable number.

12421006565 is a deficient number, since it is larger than the sum of its proper divisors (5087590555).

12421006565 is a wasteful number, since it uses less digits than its factorization.

12421006565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225253.

The product of its (nonzero) digits is 14400, while the sum is 32.

Adding to 12421006565 its reverse (56560012421), we get a palindrome (68981018986).

The spelling of 12421006565 in words is "twelve billion, four hundred twenty-one million, six thousand, five hundred sixty-five".