1212231022217 has 2 divisors, whose sum is σ = 1212231022218. Its totient is φ = 1212231022216.

The previous prime is 1212231022147. The next prime is 1212231022253. The reversal of 1212231022217 is 7122201322121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1194694906441 + 17536115776 = 1093021^2 + 132424^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212231022217 - 2²⁰ = 1212229973641 is a prime.

It is not a weakly prime, because it can be changed into another prime (1212231022297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606115511108 + 606115511109.

It is an arithmetic number, because the mean of its divisors is an integer number (606115511109).

Almost surely, 2^{1212231022217} is an apocalyptic number.

It is an amenable number.

1212231022217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212231022217 is an equidigital number, since it uses as much as digits as its factorization.

1212231022217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 26.

Adding to 1212231022217 its reverse (7122201322121), we get a palindrome (8334432344338).

The spelling of 1212231022217 in words is "one trillion, two hundred twelve billion, two hundred thirty-one million, twenty-two thousand, two hundred seventeen".