2111220212111 has 4 divisors (see below), whose sum is σ = 2222337065400. Its totient is φ = 2000103358824.

The previous prime is 2111220212099. The next prime is 2111220212137. The reversal of 2111220212111 is 1112120221112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2111220212111 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 2111220212111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111220202111) 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, 55558426616 + ... + 55558426653.

It is an arithmetic number, because the mean of its divisors is an integer number (555584266350).

Almost surely, 2^{2111220212111} is an apocalyptic number.

2111220212111 is a deficient number, since it is larger than the sum of its proper divisors (111116853289).

2111220212111 is a wasteful number, since it uses less digits than its factorization.

2111220212111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111116853288.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 2111220212111 its reverse (1112120221112), we get a palindrome (3223340433223).

Subtracting from 2111220212111 its reverse (1112120221112), we obtain a palindrome (999099990999).

The spelling of 2111220212111 in words is "two trillion, one hundred eleven billion, two hundred twenty million, two hundred twelve thousand, one hundred eleven".