1221222168397 has 16 divisors (see below), whose sum is σ = 1612125217152. Its totient is φ = 895625118720.

The previous prime is 1221222168371. The next prime is 1221222168403. The reversal of 1221222168397 is 7938612221221.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1221222168397 - 2⁷ = 1221222168269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221222168347) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 466470108 + ... + 466472725.

It is an arithmetic number, because the mean of its divisors is an integer number (100757826072).

Almost surely, 2^{1221222168397} is an apocalyptic number.

1221222168397 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1221222168397 is a deficient number, since it is larger than the sum of its proper divisors (390903048755).

1221222168397 is a wasteful number, since it uses less digits than its factorization.

1221222168397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 932942868.

The product of its digits is 290304, while the sum is 46.

The spelling of 1221222168397 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-two million, one hundred sixty-eight thousand, three hundred ninety-seven".