2112012011891 has 2 divisors, whose sum is σ = 2112012011892. Its totient is φ = 2112012011890.

The previous prime is 2112012011887. The next prime is 2112012011947. The reversal of 2112012011891 is 1981102102112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2112012011891 - 2² = 2112012011887 is a prime.

It is not a weakly prime, because it can be changed into another prime (2112012011821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1056006005945 + 1056006005946.

It is an arithmetic number, because the mean of its divisors is an integer number (1056006005946).

Almost surely, 2^{2112012011891} is an apocalyptic number.

2112012011891 is a deficient number, since it is larger than the sum of its proper divisors (1).

2112012011891 is an equidigital number, since it uses as much as digits as its factorization.

2112012011891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 29.

The spelling of 2112012011891 in words is "two trillion, one hundred twelve billion, twelve million, eleven thousand, eight hundred ninety-one".