1211313232111 has 4 divisors (see below), whose sum is σ = 1211316549552. Its totient is φ = 1211309914672.

The previous prime is 1211313232097. The next prime is 1211313232117. The reversal of 1211313232111 is 1112323131121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211313232111 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 (1211313232117) 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, 1032115 + ... + 1867588.

It is an arithmetic number, because the mean of its divisors is an integer number (302829137388).

Almost surely, 2^{1211313232111} is an apocalyptic number.

1211313232111 is a deficient number, since it is larger than the sum of its proper divisors (3317441).

1211313232111 is an equidigital number, since it uses as much as digits as its factorization.

1211313232111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3317440.

The product of its digits is 216, while the sum is 22.

Adding to 1211313232111 its reverse (1112323131121), we get a palindrome (2323636363232).

The spelling of 1211313232111 in words is "one trillion, two hundred eleven billion, three hundred thirteen million, two hundred thirty-two thousand, one hundred eleven".