1211111120201 has 2 divisors, whose sum is σ = 1211111120202. Its totient is φ = 1211111120200.

The previous prime is 1211111120189. The next prime is 1211111120213. The reversal of 1211111120201 is 1020211111121.

It is a balanced prime because it is at equal distance from previous prime (1211111120189) and next prime (1211111120213).

It can be written as a sum of positive squares in only one way, i.e., 1184449128976 + 26661991225 = 1088324^2 + 163285^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211111120201 - 2⁶ = 1211111120137 is a prime.

It is not a weakly prime, because it can be changed into another prime (1211111120231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605555560100 + 605555560101.

It is an arithmetic number, because the mean of its divisors is an integer number (605555560101).

Almost surely, 2^{1211111120201} is an apocalyptic number.

It is an amenable number.

1211111120201 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211111120201 is an equidigital number, since it uses as much as digits as its factorization.

1211111120201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 1211111120201 its reverse (1020211111121), we get a palindrome (2231322231322).

The spelling of 1211111120201 in words is "one trillion, two hundred eleven billion, one hundred eleven million, one hundred twenty thousand, two hundred one".