1011211221217 has 2 divisors, whose sum is σ = 1011211221218. Its totient is φ = 1011211221216.

The previous prime is 1011211221191. The next prime is 1011211221277. The reversal of 1011211221217 is 7121221121101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 986056944016 + 25154277201 = 993004^2 + 158601^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1011211221217 is a prime.

It is a super-2 number, since 2×1011211221217² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1011211221277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505605610608 + 505605610609.

It is an arithmetic number, because the mean of its divisors is an integer number (505605610609).

Almost surely, 2^{1011211221217} is an apocalyptic number.

It is an amenable number.

1011211221217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011211221217 is an equidigital number, since it uses as much as digits as its factorization.

1011211221217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 22.

Adding to 1011211221217 its reverse (7121221121101), we get a palindrome (8132432342318).

The spelling of 1011211221217 in words is "one trillion, eleven billion, two hundred eleven million, two hundred twenty-one thousand, two hundred seventeen".