2116611111211 has 4 divisors (see below), whose sum is σ = 2184888889024. Its totient is φ = 2048333333400.

The previous prime is 2116611111191. The next prime is 2116611111287. The reversal of 2116611111211 is 1121111166112.

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 2116611111211 - 2⁵ = 2116611111179 is a prime.

It is a super-2 number, since 2×2116611111211² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2116611111911) 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, 34138888860 + ... + 34138888921.

It is an arithmetic number, because the mean of its divisors is an integer number (546222222256).

Almost surely, 2^{2116611111211} is an apocalyptic number.

2116611111211 is a deficient number, since it is larger than the sum of its proper divisors (68277777813).

2116611111211 is an equidigital number, since it uses as much as digits as its factorization.

2116611111211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68277777812.

The product of its digits is 144, while the sum is 25.

Adding to 2116611111211 its reverse (1121111166112), we get a palindrome (3237722277323).

The spelling of 2116611111211 in words is "two trillion, one hundred sixteen billion, six hundred eleven million, one hundred eleven thousand, two hundred eleven".