1211211020011 has 4 divisors (see below), whose sum is σ = 1228270330224. Its totient is φ = 1194151709800.

The previous prime is 1211211019981. The next prime is 1211211020027. The reversal of 1211211020011 is 1100201121121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1211211020011 - 2⁵ = 1211211019979 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211211019973 and 1211211020000.

It is not an unprimeable number, because it can be changed into a prime (1211211020111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8529655000 + ... + 8529655141.

It is an arithmetic number, because the mean of its divisors is an integer number (307067582556).

Almost surely, 2^{1211211020011} is an apocalyptic number.

1211211020011 is a deficient number, since it is larger than the sum of its proper divisors (17059310213).

1211211020011 is an equidigital number, since it uses as much as digits as its factorization.

1211211020011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17059310212.

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

Adding to 1211211020011 its reverse (1100201121121), we get a palindrome (2311412141132).

The spelling of 1211211020011 in words is "one trillion, two hundred eleven billion, two hundred eleven million, twenty thousand, eleven".