1001111123211 has 4 divisors (see below), whose sum is σ = 1334814830952. Its totient is φ = 667407415472.

The previous prime is 1001111123191. The next prime is 1001111123249. The reversal of 1001111123211 is 1123211111001.

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 1001111123211 - 2⁹ = 1001111122699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1001111123611) 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, 166851853866 + ... + 166851853871.

It is an arithmetic number, because the mean of its divisors is an integer number (333703707738).

Almost surely, 2^{1001111123211} is an apocalyptic number.

1001111123211 is a deficient number, since it is larger than the sum of its proper divisors (333703707741).

1001111123211 is an equidigital number, since it uses as much as digits as its factorization.

1001111123211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333703707740.

The product of its (nonzero) digits is 12, while the sum is 15.

Adding to 1001111123211 its reverse (1123211111001), we get a palindrome (2124322234212).

The spelling of 1001111123211 in words is "one trillion, one billion, one hundred eleven million, one hundred twenty-three thousand, two hundred eleven".