1001120211205 has 4 divisors (see below), whose sum is σ = 1201344253452. Its totient is φ = 800896168960.

The previous prime is 1001120211187. The next prime is 1001120211233. The reversal of 1001120211205 is 5021120211001.

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

It can be written as a sum of positive squares in 2 ways, for example, as 157718591044 + 843401620161 = 397138^2 + 918369^2 .

It is not a de Polignac number, because 1001120211205 - 2⁹ = 1001120210693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100112021116 + ... + 100112021125.

It is an arithmetic number, because the mean of its divisors is an integer number (300336063363).

Almost surely, 2^{1001120211205} is an apocalyptic number.

It is an amenable number.

1001120211205 is a deficient number, since it is larger than the sum of its proper divisors (200224042247).

1001120211205 is an equidigital number, since it uses as much as digits as its factorization.

1001120211205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200224042246.

The product of its (nonzero) digits is 40, while the sum is 16.

Adding to 1001120211205 its reverse (5021120211001), we get a palindrome (6022240422206).

The spelling of 1001120211205 in words is "one trillion, one billion, one hundred twenty million, two hundred eleven thousand, two hundred five".