1211340412111 has 4 divisors (see below), whose sum is σ = 1211961933000. Its totient is φ = 1210718891224.

The previous prime is 1211340412099. The next prime is 1211340412159. The reversal of 1211340412111 is 1112140431121.

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 1211340412111 - 2²¹ = 1211338314959 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 (1211340415111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 310757521 + ... + 310761418.

It is an arithmetic number, because the mean of its divisors is an integer number (302990483250).

Almost surely, 2^{1211340412111} is an apocalyptic number.

1211340412111 is a deficient number, since it is larger than the sum of its proper divisors (621520889).

1211340412111 is an equidigital number, since it uses as much as digits as its factorization.

1211340412111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621520888.

The product of its (nonzero) digits is 192, while the sum is 22.

Adding to 1211340412111 its reverse (1112140431121), we get a palindrome (2323480843232).

The spelling of 1211340412111 in words is "one trillion, two hundred eleven billion, three hundred forty million, four hundred twelve thousand, one hundred eleven".