1991012200211 has 2 divisors, whose sum is σ = 1991012200212. Its totient is φ = 1991012200210.

The previous prime is 1991012200207. The next prime is 1991012200231. The reversal of 1991012200211 is 1120022101991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1991012200211 - 2² = 1991012200207 is a prime.

It is not a weakly prime, because it can be changed into another prime (1991012200231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 995506100105 + 995506100106.

It is an arithmetic number, because the mean of its divisors is an integer number (995506100106).

Almost surely, 2^{1991012200211} is an apocalyptic number.

1991012200211 is a deficient number, since it is larger than the sum of its proper divisors (1).

1991012200211 is an equidigital number, since it uses as much as digits as its factorization.

1991012200211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 29.

The spelling of 1991012200211 in words is "one trillion, nine hundred ninety-one billion, twelve million, two hundred thousand, two hundred eleven".