1201112311111 has 4 divisors (see below), whose sum is σ = 1202698985992. Its totient is φ = 1199525636232.

The previous prime is 1201112311099. The next prime is 1201112311123. The reversal of 1201112311111 is 1111132111021.

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

It is an interprime number because it is at equal distance from previous prime (1201112311099) and next prime (1201112311123).

It is a cyclic number.

It is not a de Polignac number, because 1201112311111 - 2⁹ = 1201112310599 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 (1201112311181) 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, 793336305 + ... + 793337818.

It is an arithmetic number, because the mean of its divisors is an integer number (300674746498).

Almost surely, 2^{1201112311111} is an apocalyptic number.

1201112311111 is a deficient number, since it is larger than the sum of its proper divisors (1586674881).

1201112311111 is an equidigital number, since it uses as much as digits as its factorization.

1201112311111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1586674880.

The product of its (nonzero) digits is 12, while the sum is 16.

Adding to 1201112311111 its reverse (1111132111021), we get a palindrome (2312244422132).

The spelling of 1201112311111 in words is "one trillion, two hundred one billion, one hundred twelve million, three hundred eleven thousand, one hundred eleven".