1211011999999 has 2 divisors, whose sum is σ = 1211012000000. Its totient is φ = 1211011999998.

The previous prime is 1211011999979. The next prime is 1211012000027. The reversal of 1211011999999 is 9999991101121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1211011999999 - 2²⁷ = 1210877782271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211011999919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605505999999 + 605506000000.

It is an arithmetic number, because the mean of its divisors is an integer number (605506000000).

Almost surely, 2^{1211011999999} is an apocalyptic number.

1211011999999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211011999999 is an equidigital number, since it uses as much as digits as its factorization.

1211011999999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1062882, while the sum is 61.

The spelling of 1211011999999 in words is "one trillion, two hundred eleven billion, eleven million, nine hundred ninety-nine thousand, nine hundred ninety-nine".