1221222122117 has 2 divisors, whose sum is σ = 1221222122118. Its totient is φ = 1221222122116.

The previous prime is 1221222122077. The next prime is 1221222122177. The reversal of 1221222122117 is 7112212221221.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 693912324196 + 527309797921 = 833014^2 + 726161^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221222122117 - 2⁴⁰ = 121710494341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221222122177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610611061058 + 610611061059.

It is an arithmetic number, because the mean of its divisors is an integer number (610611061059).

Almost surely, 2^{1221222122117} is an apocalyptic number.

It is an amenable number.

1221222122117 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221222122117 is an equidigital number, since it uses as much as digits as its factorization.

1221222122117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 896, while the sum is 26.

Adding to 1221222122117 its reverse (7112212221221), we get a palindrome (8333434343338).

The spelling of 1221222122117 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-two million, one hundred twenty-two thousand, one hundred seventeen".