1222222111997 has 2 divisors, whose sum is σ = 1222222111998. Its totient is φ = 1222222111996.

The previous prime is 1222222111987. The next prime is 1222222112029. The reversal of 1222222111997 is 7991112222221.

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., 891912136921 + 330309975076 = 944411^2 + 574726^2 .

It is an emirp because it is prime and its reverse (7991112222221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1222222111997 - 2⁸ = 1222222111741 is a prime.

It is a super-2 number, since 2×1222222111997² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1222222111907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611111055998 + 611111055999.

It is an arithmetic number, because the mean of its divisors is an integer number (611111055999).

Almost surely, 2^{1222222111997} is an apocalyptic number.

It is an amenable number.

1222222111997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1222222111997 is an equidigital number, since it uses as much as digits as its factorization.

1222222111997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 41.

The spelling of 1222222111997 in words is "one trillion, two hundred twenty-two billion, two hundred twenty-two million, one hundred eleven thousand, nine hundred ninety-seven".