1212221012117 has 2 divisors, whose sum is σ = 1212221012118. Its totient is φ = 1212221012116.

The previous prime is 1212221012083. The next prime is 1212221012129. The reversal of 1212221012117 is 7112101222121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1183241397361 + 28979614756 = 1087769^2 + 170234^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212221012117 - 2¹⁸ = 1212220749973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1212221012092 and 1212221012101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212221018117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606110506058 + 606110506059.

It is an arithmetic number, because the mean of its divisors is an integer number (606110506059).

Almost surely, 2^{1212221012117} is an apocalyptic number.

It is an amenable number.

1212221012117 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212221012117 is an equidigital number, since it uses as much as digits as its factorization.

1212221012117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 224, while the sum is 23.

Adding to 1212221012117 its reverse (7112101222121), we get a palindrome (8324322234238).

The spelling of 1212221012117 in words is "one trillion, two hundred twelve billion, two hundred twenty-one million, twelve thousand, one hundred seventeen".