1112211111001 has 2 divisors, whose sum is σ = 1112211111002. Its totient is φ = 1112211111000.

The previous prime is 1112211110971. The next prime is 1112211111041. The reversal of 1112211111001 is 1001111122111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 815316896601 + 296894214400 = 902949^2 + 544880^2 .

It is an emirp because it is prime and its reverse (1001111122111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1112211111001 - 2²⁷ = 1112076893273 is a prime.

It is not a weakly prime, because it can be changed into another prime (1112211111041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 556105555500 + 556105555501.

It is an arithmetic number, because the mean of its divisors is an integer number (556105555501).

Almost surely, 2^{1112211111001} is an apocalyptic number.

It is an amenable number.

1112211111001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1112211111001 is an equidigital number, since it uses as much as digits as its factorization.

1112211111001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 1112211111001 its reverse (1001111122111), we get a palindrome (2113322233112).

The spelling of 1112211111001 in words is "one trillion, one hundred twelve billion, two hundred eleven million, one hundred eleven thousand, one".