1211340033311 has 4 divisors (see below), whose sum is σ = 1211343061824. Its totient is φ = 1211337004800.

The previous prime is 1211340033203. The next prime is 1211340033317. The reversal of 1211340033311 is 1133300431121.

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 1211340033311 - 2³⁸ = 936462126367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211340033317) 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, 802895 + ... + 1751376.

It is an arithmetic number, because the mean of its divisors is an integer number (302835765456).

Almost surely, 2^{1211340033311} is an apocalyptic number.

1211340033311 is a deficient number, since it is larger than the sum of its proper divisors (3028513).

1211340033311 is an equidigital number, since it uses as much as digits as its factorization.

1211340033311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3028512.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 1211340033311 its reverse (1133300431121), we get a palindrome (2344640464432).

The spelling of 1211340033311 in words is "one trillion, two hundred eleven billion, three hundred forty million, thirty-three thousand, three hundred eleven".