1211003120011 has 4 divisors (see below), whose sum is σ = 1229077793512. Its totient is φ = 1192928446512.

The previous prime is 1211003120009. The next prime is 1211003120021. The reversal of 1211003120011 is 1100213001121.

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 1211003120011 - 2¹ = 1211003120009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211003119973 and 1211003120000.

It is not an unprimeable number, because it can be changed into a prime (1211003120021) 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, 9037336650 + ... + 9037336783.

It is an arithmetic number, because the mean of its divisors is an integer number (307269448378).

Almost surely, 2^{1211003120011} is an apocalyptic number.

1211003120011 is a deficient number, since it is larger than the sum of its proper divisors (18074673501).

1211003120011 is an equidigital number, since it uses as much as digits as its factorization.

1211003120011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18074673500.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 1211003120011 its reverse (1100213001121), we get a palindrome (2311216121132).

The spelling of 1211003120011 in words is "one trillion, two hundred eleven billion, three million, one hundred twenty thousand, eleven".