12421330565 has 8 divisors (see below), whose sum is σ = 17034967680. Its totient is φ = 8517483792.

The previous prime is 12421330561. The next prime is 12421330567. The reversal of 12421330565 is 56503312421.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 12421330565 - 2² = 12421330561 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12421330561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 177447545 + ... + 177447614.

It is an arithmetic number, because the mean of its divisors is an integer number (2129370960).

Almost surely, 2^12421330565 is an apocalyptic number.

It is an amenable number.

12421330565 is a deficient number, since it is larger than the sum of its proper divisors (4613637115).

12421330565 is an equidigital number, since it uses as much as digits as its factorization.

12421330565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354895171.

The product of its (nonzero) digits is 21600, while the sum is 32.

Adding to 12421330565 its reverse (56503312421), we get a palindrome (68924642986).

The spelling of 12421330565 in words is "twelve billion, four hundred twenty-one million, three hundred thirty thousand, five hundred sixty-five".