2021161111 has 2 divisors, whose sum is σ = 2021161112. Its totient is φ = 2021161110.

The previous prime is 2021161067. The next prime is 2021161151. The reversal of 2021161111 is 1111611202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2021161111 - 2⁷ = 2021160983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021161151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010580555 + 1010580556.

It is an arithmetic number, because the mean of its divisors is an integer number (1010580556).

Almost surely, 2^2021161111 is an apocalyptic number.

2021161111 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021161111 is an equidigital number, since it uses as much as digits as its factorization.

2021161111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 16.

The square root of 2021161111 is about 44957.3254431355. The cubic root of 2021161111 is about 1264.3490244751.

Adding to 2021161111 its reverse (1111611202), we get a palindrome (3132772313).

The spelling of 2021161111 in words is "two billion, twenty-one million, one hundred sixty-one thousand, one hundred eleven".