21241412565 has 8 divisors (see below), whose sum is σ = 33986260128. Its totient is φ = 11328753360.

The previous prime is 21241412561. The next prime is 21241412581. The reversal of 21241412565 is 56521414212.

It is a happy number.

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

It is not a de Polignac number, because 21241412565 - 2² = 21241412561 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21241412561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 708047071 + ... + 708047100.

It is an arithmetic number, because the mean of its divisors is an integer number (4248282516).

Almost surely, 2^21241412565 is an apocalyptic number.

It is an amenable number.

21241412565 is a deficient number, since it is larger than the sum of its proper divisors (12744847563).

21241412565 is a wasteful number, since it uses less digits than its factorization.

21241412565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1416094179.

The product of its digits is 19200, while the sum is 33.

Adding to 21241412565 its reverse (56521414212), we get a palindrome (77762826777).

The spelling of 21241412565 in words is "twenty-one billion, two hundred forty-one million, four hundred twelve thousand, five hundred sixty-five".