1211111233311 has 32 divisors (see below), whose sum is σ = 1902383677440. Its totient is φ = 671008477536.

The previous prime is 1211111233261. The next prime is 1211111233351. The reversal of 1211111233311 is 1133321111121.

It is not a de Polignac number, because 1211111233311 - 2²³ = 1211102844703 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211111233351) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5628331 + ... + 5839548.

It is an arithmetic number, because the mean of its divisors is an integer number (59449489920).

Almost surely, 2^{1211111233311} is an apocalyptic number.

1211111233311 is a deficient number, since it is larger than the sum of its proper divisors (691272444129).

1211111233311 is a wasteful number, since it uses less digits than its factorization.

1211111233311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11468043.

The product of its digits is 108, while the sum is 21.

Adding to 1211111233311 its reverse (1133321111121), we get a palindrome (2344432344432).

The spelling of 1211111233311 in words is "one trillion, two hundred eleven billion, one hundred eleven million, two hundred thirty-three thousand, three hundred eleven".