1011212201111 has 4 divisors (see below), whose sum is σ = 1155671086992. Its totient is φ = 866753315232.

The previous prime is 1011212201089. The next prime is 1011212201117. The reversal of 1011212201111 is 1111022121101.

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

It is not a de Polignac number, because 1011212201111 - 2¹⁸ = 1011211938967 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 (1011212201117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72229442930 + ... + 72229442943.

It is an arithmetic number, because the mean of its divisors is an integer number (288917771748).

Almost surely, 2^{1011212201111} is an apocalyptic number.

1011212201111 is a deficient number, since it is larger than the sum of its proper divisors (144458885881).

1011212201111 is an equidigital number, since it uses as much as digits as its factorization.

1011212201111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144458885880.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 1011212201111 its reverse (1111022121101), we get a palindrome (2122234322212).

The spelling of 1011212201111 in words is "one trillion, eleven billion, two hundred twelve million, two hundred one thousand, one hundred eleven".