21325336517 has 2 divisors, whose sum is σ = 21325336518. Its totient is φ = 21325336516.

The previous prime is 21325336477. The next prime is 21325336619. The reversal of 21325336517 is 71563352312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19089843556 + 2235492961 = 138166^2 + 47281^2 .

It is a cyclic number.

It is not a de Polignac number, because 21325336517 - 2¹² = 21325332421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21325336217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10662668258 + 10662668259.

It is an arithmetic number, because the mean of its divisors is an integer number (10662668259).

Almost surely, 2^21325336517 is an apocalyptic number.

It is an amenable number.

21325336517 is a deficient number, since it is larger than the sum of its proper divisors (1).

21325336517 is an equidigital number, since it uses as much as digits as its factorization.

21325336517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 113400, while the sum is 38.

Adding to 21325336517 its reverse (71563352312), we get a palindrome (92888688829).

The spelling of 21325336517 in words is "twenty-one billion, three hundred twenty-five million, three hundred thirty-six thousand, five hundred seventeen".