2111211643 has 2 divisors, whose sum is σ = 2111211644. Its totient is φ = 2111211642.

The previous prime is 2111211587. The next prime is 2111211763. The reversal of 2111211643 is 3461121112.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2111211643 is a prime.

It is not a weakly prime, because it can be changed into another prime (2111217643) 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, 1055605821 + 1055605822.

It is an arithmetic number, because the mean of its divisors is an integer number (1055605822).

Almost surely, 2^2111211643 is an apocalyptic number.

2111211643 is a deficient number, since it is larger than the sum of its proper divisors (1).

2111211643 is an equidigital number, since it uses as much as digits as its factorization.

2111211643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288, while the sum is 22.

The square root of 2111211643 is about 45947.9231630767. The cubic root of 2111211643 is about 1282.8540731070.

Adding to 2111211643 its reverse (3461121112), we get a palindrome (5572332755).

The spelling of 2111211643 in words is "two billion, one hundred eleven million, two hundred eleven thousand, six hundred forty-three".