21423463617 has 4 divisors (see below), whose sum is σ = 28564618160. Its totient is φ = 14282309076.

The previous prime is 21423463591. The next prime is 21423463651. The reversal of 21423463617 is 71636432412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21423463617 - 2⁸ = 21423463361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21423463517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3570577267 + ... + 3570577272.

It is an arithmetic number, because the mean of its divisors is an integer number (7141154540).

Almost surely, 2^21423463617 is an apocalyptic number.

It is an amenable number.

21423463617 is a deficient number, since it is larger than the sum of its proper divisors (7141154543).

21423463617 is an equidigital number, since it uses as much as digits as its factorization.

21423463617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7141154542.

The product of its digits is 145152, while the sum is 39.

The spelling of 21423463617 in words is "twenty-one billion, four hundred twenty-three million, four hundred sixty-three thousand, six hundred seventeen".