11111111201 has 4 divisors (see below), whose sum is σ = 11150652804. Its totient is φ = 11071569600.

The previous prime is 11111111159. The next prime is 11111111237. The reversal of 11111111201 is 10211111111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10211111111 = 31 ⋅329390681.

It can be written as a sum of positive squares in 2 ways, for example, as 2580741601 + 8530369600 = 50801^2 + 92360^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11111111201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11111110201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19770380 + ... + 19770941.

It is an arithmetic number, because the mean of its divisors is an integer number (2787663201).

Almost surely, 2^11111111201 is an apocalyptic number.

It is an amenable number.

11111111201 is a deficient number, since it is larger than the sum of its proper divisors (39541603).

11111111201 is an equidigital number, since it uses as much as digits as its factorization.

11111111201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39541602.

The product of its (nonzero) digits is 2, while the sum is 11.

Adding to 11111111201 its reverse (10211111111), we get a palindrome (21322222312).

The spelling of 11111111201 in words is "eleven billion, one hundred eleven million, one hundred eleven thousand, two hundred one".