2021122111 has 2 divisors, whose sum is σ = 2021122112. Its totient is φ = 2021122110.

The previous prime is 2021122109. The next prime is 2021122121. The reversal of 2021122111 is 1112211202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2021122111 - 2¹ = 2021122109 is a prime.

Together with 2021122109, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 2021122091 and 2021122100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021122121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010561055 + 1010561056.

It is an arithmetic number, because the mean of its divisors is an integer number (1010561056).

Almost surely, 2^2021122111 is an apocalyptic number.

2021122111 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021122111 is an equidigital number, since it uses as much as digits as its factorization.

2021122111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 2021122111 is about 44956.8916963795. The cubic root of 2021122111 is about 1264.3408921976.

Adding to 2021122111 its reverse (1112211202), we get a palindrome (3133333313).

The spelling of 2021122111 in words is "two billion, twenty-one million, one hundred twenty-two thousand, one hundred eleven".