11212221100111 has 4 divisors (see below), whose sum is σ = 11212228297872. Its totient is φ = 11212213902352.

The previous prime is 11212221100099. The next prime is 11212221100123. The reversal of 11212221100111 is 11100112221211.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (11212221100099) and next prime (11212221100123).

It is a cyclic number.

It is not a de Polignac number, because 11212221100111 - 2¹⁷ = 11212220969039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11212221101111) 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, 179035 + ... + 4738828.

It is an arithmetic number, because the mean of its divisors is an integer number (2803057074468).

Almost surely, 2^{11212221100111} is an apocalyptic number.

11212221100111 is a deficient number, since it is larger than the sum of its proper divisors (7197761).

11212221100111 is an equidigital number, since it uses as much as digits as its factorization.

11212221100111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7197760.

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

Adding to 11212221100111 its reverse (11100112221211), we get a palindrome (22312333321322).

It can be divided in two parts, 11212221100 and 111, that added together give a palindrome (11212221211).

The spelling of 11212221100111 in words is "eleven trillion, two hundred twelve billion, two hundred twenty-one million, one hundred thousand, one hundred eleven".