13642320217 has 2 divisors, whose sum is σ = 13642320218. Its totient is φ = 13642320216.

The previous prime is 13642320203. The next prime is 13642320247. The reversal of 13642320217 is 71202324631.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13144851801 + 497468416 = 114651^2 + 22304^2 .

It is a cyclic number.

It is not a de Polignac number, because 13642320217 - 2¹⁹ = 13641795929 is a prime.

It is a super-2 number, since 2×13642320217² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (13642320247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6821160108 + 6821160109.

It is an arithmetic number, because the mean of its divisors is an integer number (6821160109).

Almost surely, 2^13642320217 is an apocalyptic number.

It is an amenable number.

13642320217 is a deficient number, since it is larger than the sum of its proper divisors (1).

13642320217 is an equidigital number, since it uses as much as digits as its factorization.

13642320217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 31.

Adding to 13642320217 its reverse (71202324631), we get a palindrome (84844644848).

The spelling of 13642320217 in words is "thirteen billion, six hundred forty-two million, three hundred twenty thousand, two hundred seventeen".