2021111211111 has 16 divisors (see below), whose sum is σ = 2840517287040. Its totient is φ = 1274749803360.

The previous prime is 2021111211103. The next prime is 2021111211127. The reversal of 2021111211111 is 1111121111202.

It is not a de Polignac number, because 2021111211111 - 2³ = 2021111211103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021111211211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24145185 + ... + 24228746.

It is an arithmetic number, because the mean of its divisors is an integer number (177532330440).

Almost surely, 2^{2021111211111} is an apocalyptic number.

2021111211111 is a deficient number, since it is larger than the sum of its proper divisors (819406075929).

2021111211111 is a wasteful number, since it uses less digits than its factorization.

2021111211111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48374686.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 2021111211111 its reverse (1111121111202), we get a palindrome (3132232322313).

Subtracting from 2021111211111 its reverse (1111121111202), we obtain a palindrome (909990099909).

The spelling of 2021111211111 in words is "two trillion, twenty-one billion, one hundred eleven million, two hundred eleven thousand, one hundred eleven".