2111111111211 has 4 divisors (see below), whose sum is σ = 2814814814952. Its totient is φ = 1407407407472.

The previous prime is 2111111111111. The next prime is 2111111111233. The reversal of 2111111111211 is 1121111111112.

It is a happy number.

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 2111111111211 - 2⁹ = 2111111110699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2111111111111) 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, 351851851866 + ... + 351851851871.

It is an arithmetic number, because the mean of its divisors is an integer number (703703703738).

Almost surely, 2^{2111111111211} is an apocalyptic number.

2111111111211 is a deficient number, since it is larger than the sum of its proper divisors (703703703741).

2111111111211 is an equidigital number, since it uses as much as digits as its factorization.

2111111111211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 703703703740.

The product of its digits is 4, while the sum is 15.

Adding to 2111111111211 its reverse (1121111111112), we get a palindrome (3232222222323).

Subtracting from 2111111111211 its reverse (1121111111112), we obtain a palindrome (990000000099).

It can be divided in two parts, 21111111112 and 11, that multiplied together give a palindrome (232222222232).

The spelling of 2111111111211 in words is "two trillion, one hundred eleven billion, one hundred eleven million, one hundred eleven thousand, two hundred eleven".