1211011320217 has 2 divisors, whose sum is σ = 1211011320218. Its totient is φ = 1211011320216.

The previous prime is 1211011320209. The next prime is 1211011320287. The reversal of 1211011320217 is 7120231101121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 787814232921 + 423197087296 = 887589^2 + 650536^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211011320217 - 2³ = 1211011320209 is a prime.

It is not a weakly prime, because it can be changed into another prime (1211011320287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605505660108 + 605505660109.

It is an arithmetic number, because the mean of its divisors is an integer number (605505660109).

Almost surely, 2^{1211011320217} is an apocalyptic number.

It is an amenable number.

1211011320217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211011320217 is an equidigital number, since it uses as much as digits as its factorization.

1211011320217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168, while the sum is 22.

Adding to 1211011320217 its reverse (7120231101121), we get a palindrome (8331242421338).

The spelling of 1211011320217 in words is "one trillion, two hundred eleven billion, eleven million, three hundred twenty thousand, two hundred seventeen".