11111222201111 has 4 divisors (see below), whose sum is σ = 11115419869872. Its totient is φ = 11107024532352.

The previous prime is 11111222201077. The next prime is 11111222201129. The reversal of 11111222201111 is 11110222211111.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11111222201111 - 2²² = 11111218006807 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11111222201111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111222201011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2098830410 + ... + 2098835703.

It is an arithmetic number, because the mean of its divisors is an integer number (2778854967468).

Almost surely, 2^{11111222201111} is an apocalyptic number.

11111222201111 is a deficient number, since it is larger than the sum of its proper divisors (4197668761).

11111222201111 is an equidigital number, since it uses as much as digits as its factorization.

11111222201111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4197668760.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 11111222201111 its reverse (11110222211111), we get a palindrome (22221444412222).

It can be divided in two parts, 11111 and 222201111, that added together give a palindrome (222212222).

The spelling of 11111222201111 in words is "eleven trillion, one hundred eleven billion, two hundred twenty-two million, two hundred one thousand, one hundred eleven".