1211320211011 has 2 divisors, whose sum is σ = 1211320211012. Its totient is φ = 1211320211010.

The previous prime is 1211320210993. The next prime is 1211320211033. The reversal of 1211320211011 is 1101120231121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1211320211011 - 2⁷ = 1211320210883 is a prime.

It is not a weakly prime, because it can be changed into another prime (1211320211041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605660105505 + 605660105506.

It is an arithmetic number, because the mean of its divisors is an integer number (605660105506).

Almost surely, 2^{1211320211011} is an apocalyptic number.

1211320211011 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211320211011 is an equidigital number, since it uses as much as digits as its factorization.

1211320211011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 1211320211011 its reverse (1101120231121), we get a palindrome (2312440442132).

The spelling of 1211320211011 in words is "one trillion, two hundred eleven billion, three hundred twenty million, two hundred eleven thousand, eleven".