11111220111 has 8 divisors (see below), whose sum is σ = 15686428464. Its totient is φ = 6971745920.

The previous prime is 11111220073. The next prime is 11111220161. The reversal of 11111220111 is 11102211111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11111220111 - 2¹³ = 11111211919 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111220161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108933480 + ... + 108933581.

It is an arithmetic number, because the mean of its divisors is an integer number (1960803558).

Almost surely, 2^11111220111 is an apocalyptic number.

11111220111 is a deficient number, since it is larger than the sum of its proper divisors (4575208353).

11111220111 is a wasteful number, since it uses less digits than its factorization.

11111220111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217867081.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 11111220111 its reverse (11102211111), we get a palindrome (22213431222).

The spelling of 11111220111 in words is "eleven billion, one hundred eleven million, two hundred twenty thousand, one hundred eleven".