513342222521 has 4 divisors (see below), whose sum is σ = 531043678500. Its totient is φ = 495640766544.

The previous prime is 513342222487. The next prime is 513342222529. The reversal of 513342222521 is 125222243315.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 139606849600 + 373735372921 = 373640^2 + 611339^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-513342222521 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (513342222529) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8850727946 + ... + 8850728003.

It is an arithmetic number, because the mean of its divisors is an integer number (132760919625).

Almost surely, 2^513342222521 is an apocalyptic number.

It is an amenable number.

513342222521 is a deficient number, since it is larger than the sum of its proper divisors (17701455979).

513342222521 is a wasteful number, since it uses less digits than its factorization.

513342222521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17701455978.

The product of its digits is 28800, while the sum is 32.

Adding to 513342222521 its reverse (125222243315), we get a palindrome (638564465836).

The spelling of 513342222521 in words is "five hundred thirteen billion, three hundred forty-two million, two hundred twenty-two thousand, five hundred twenty-one".