2021110111211 has 2 divisors, whose sum is σ = 2021110111212. Its totient is φ = 2021110111210.

The previous prime is 2021110111199. The next prime is 2021110111217. The reversal of 2021110111211 is 1121110111202.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2021110111211 is a prime.

It is not a weakly prime, because it can be changed into another prime (2021110111217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010555055605 + 1010555055606.

It is an arithmetic number, because the mean of its divisors is an integer number (1010555055606).

Almost surely, 2^{2021110111211} is an apocalyptic number.

2021110111211 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021110111211 is an equidigital number, since it uses as much as digits as its factorization.

2021110111211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 2021110111211 its reverse (1121110111202), we get a palindrome (3142220222413).

Subtracting from 2021110111211 its reverse (1121110111202), we obtain a palindrome (900000000009).

The spelling of 2021110111211 in words is "two trillion, twenty-one billion, one hundred ten million, one hundred eleven thousand, two hundred eleven".