2011111021217 has 4 divisors (see below), whose sum is σ = 2011130443056. Its totient is φ = 2011091599380.

The previous prime is 2011111021193. The next prime is 2011111021289. The reversal of 2011111021217 is 7121201111102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2011111021217 is a prime.

It is a super-2 number, since 2×2011111021217² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2011111521217) 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, 9554759 + ... + 9762972.

It is an arithmetic number, because the mean of its divisors is an integer number (502782610764).

Almost surely, 2^{2011111021217} is an apocalyptic number.

It is an amenable number.

2011111021217 is a deficient number, since it is larger than the sum of its proper divisors (19421839).

2011111021217 is a wasteful number, since it uses less digits than its factorization.

2011111021217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19421838.

The product of its (nonzero) digits is 56, while the sum is 20.

Adding to 2011111021217 its reverse (7121201111102), we get a palindrome (9132312132319).

The spelling of 2011111021217 in words is "two trillion, eleven billion, one hundred eleven million, twenty-one thousand, two hundred seventeen".