217240646141 has 2 divisors, whose sum is σ = 217240646142. Its totient is φ = 217240646140.

The previous prime is 217240646137. The next prime is 217240646167. The reversal of 217240646141 is 141646042712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 144639499225 + 72601146916 = 380315^2 + 269446^2 .

It is a cyclic number.

It is not a de Polignac number, because 217240646141 - 2² = 217240646137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 217240646095 and 217240646104.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217240646111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108620323070 + 108620323071.

It is an arithmetic number, because the mean of its divisors is an integer number (108620323071).

Almost surely, 2^217240646141 is an apocalyptic number.

It is an amenable number.

217240646141 is a deficient number, since it is larger than the sum of its proper divisors (1).

217240646141 is an equidigital number, since it uses as much as digits as its factorization.

217240646141 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64512, while the sum is 38.

Adding to 217240646141 its reverse (141646042712), we get a palindrome (358886688853).

The spelling of 217240646141 in words is "two hundred seventeen billion, two hundred forty million, six hundred forty-six thousand, one hundred forty-one".