1211102120011 has 16 divisors (see below), whose sum is σ = 1417126772736. Its totient is φ = 1013441258016.

The previous prime is 1211102119987. The next prime is 1211102120029. The reversal of 1211102120011 is 1100212011121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1211102120011 - 2¹¹ = 1211102117963 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211102119973 and 1211102120000.

It is not an unprimeable number, because it can be changed into a prime (1211102120051) 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 in 15 ways as a sum of consecutive naturals, for example, 4505611 + ... + 4766836.

It is an arithmetic number, because the mean of its divisors is an integer number (88570423296).

Almost surely, 2^{1211102120011} is an apocalyptic number.

1211102120011 is a deficient number, since it is larger than the sum of its proper divisors (206024652725).

1211102120011 is an equidigital number, since it uses as much as digits as its factorization.

1211102120011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9272898.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1211102120011 its reverse (1100212011121), we get a palindrome (2311314131132).

The spelling of 1211102120011 in words is "one trillion, two hundred eleven billion, one hundred two million, one hundred twenty thousand, eleven".