2111111112221 has 4 divisors (see below), whose sum is σ = 2117489091744. Its totient is φ = 2104733132700.

The previous prime is 2111111112197. The next prime is 2111111112233. The reversal of 2111111112221 is 1222111111112.

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-2111111112221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2111111112221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111111112241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3188989265 + ... + 3188989926.

It is an arithmetic number, because the mean of its divisors is an integer number (529372272936).

Almost surely, 2^{2111111112221} is an apocalyptic number.

It is an amenable number.

2111111112221 is a deficient number, since it is larger than the sum of its proper divisors (6377979523).

2111111112221 is an equidigital number, since it uses as much as digits as its factorization.

2111111112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6377979522.

The product of its digits is 16, while the sum is 17.

Adding to 2111111112221 its reverse (1222111111112), we get a palindrome (3333222223333).

The spelling of 2111111112221 in words is "two trillion, one hundred eleven billion, one hundred eleven million, one hundred twelve thousand, two hundred twenty-one".