2100111011111 has 4 divisors (see below), whose sum is σ = 2100114321000. Its totient is φ = 2100107701224.

The previous prime is 2100111011099. The next prime is 2100111011129. The reversal of 2100111011111 is 1111101110012.

It is a happy number.

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-2100111011111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2100111011092 and 2100111011101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100111011171) 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, 371336 + ... + 2082813.

It is an arithmetic number, because the mean of its divisors is an integer number (525028580250).

Almost surely, 2^{2100111011111} is an apocalyptic number.

2100111011111 is a deficient number, since it is larger than the sum of its proper divisors (3309889).

2100111011111 is an equidigital number, since it uses as much as digits as its factorization.

2100111011111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3309888.

The product of its (nonzero) digits is 2, while the sum is 11.

Adding to 2100111011111 its reverse (1111101110012), we get a palindrome (3211212121123).

The spelling of 2100111011111 in words is "two trillion, one hundred billion, one hundred eleven million, eleven thousand, one hundred eleven".