1222222111001 has 2 divisors, whose sum is σ = 1222222111002. Its totient is φ = 1222222111000.

The previous prime is 1222222110997. The next prime is 1222222111007. The reversal of 1222222111001 is 1001112222221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1060794942601 + 161427168400 = 1029949^2 + 401780^2 .

It is a cyclic number.

It is not a de Polignac number, because 1222222111001 - 2² = 1222222110997 is a prime.

It is not a weakly prime, because it can be changed into another prime (1222222111007) 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, 611111055500 + 611111055501.

It is an arithmetic number, because the mean of its divisors is an integer number (611111055501).

Almost surely, 2^{1222222111001} is an apocalyptic number.

It is an amenable number.

1222222111001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1222222111001 is an equidigital number, since it uses as much as digits as its factorization.

1222222111001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1222222111001 its reverse (1001112222221), we get a palindrome (2223334333222).

The spelling of 1222222111001 in words is "one trillion, two hundred twenty-two billion, two hundred twenty-two million, one hundred eleven thousand, one".