2211111212111 has 4 divisors (see below), whose sum is σ = 2211147011424. Its totient is φ = 2211075412800.

The previous prime is 2211111212077. The next prime is 2211111212131. The reversal of 2211111212111 is 1112121111122.

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 2211111212111 - 2¹⁰ = 2211111211087 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 2211111212111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2211111212131) 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, 17806850 + ... + 17930591.

It is an arithmetic number, because the mean of its divisors is an integer number (552786752856).

Almost surely, 2^{2211111212111} is an apocalyptic number.

2211111212111 is a deficient number, since it is larger than the sum of its proper divisors (35799313).

2211111212111 is an equidigital number, since it uses as much as digits as its factorization.

2211111212111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35799312.

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

Adding to 2211111212111 its reverse (1112121111122), we get a palindrome (3323232323233).

The spelling of 2211111212111 in words is "two trillion, two hundred eleven billion, one hundred eleven million, two hundred twelve thousand, one hundred eleven".