23420520007217 has 4 divisors (see below), whose sum is σ = 23439122486640. Its totient is φ = 23401917527796.

The previous prime is 23420520007187. The next prime is 23420520007223. The reversal of 23420520007217 is 71270002502432.

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 a cyclic number.

It is not a de Polignac number, because 23420520007217 - 2⁶ = 23420520007153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23420520007237) 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 3 ways as a sum of consecutive naturals, for example, 9301237823 + ... + 9301240340.

It is an arithmetic number, because the mean of its divisors is an integer number (5859780621660).

Almost surely, 2^{23420520007217} is an apocalyptic number.

It is an amenable number.

23420520007217 is a deficient number, since it is larger than the sum of its proper divisors (18602479423).

23420520007217 is a wasteful number, since it uses less digits than its factorization.

23420520007217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18602479422.

The product of its (nonzero) digits is 47040, while the sum is 35.

Adding to 23420520007217 its reverse (71270002502432), we get a palindrome (94690522509649).

The spelling of 23420520007217 in words is "twenty-three trillion, four hundred twenty billion, five hundred twenty million, seven thousand, two hundred seventeen".