2111221220111 has 4 divisors (see below), whose sum is σ = 2111225690400. Its totient is φ = 2111216749824.

The previous prime is 2111221220041. The next prime is 2111221220113. The reversal of 2111221220111 is 1110221221112.

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 2111221220111 - 2³⁰ = 2110147478287 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 2111221220111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111221220113) 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, 1430066 + ... + 2503503.

It is an arithmetic number, because the mean of its divisors is an integer number (527806422600).

Almost surely, 2^{2111221220111} is an apocalyptic number.

2111221220111 is a deficient number, since it is larger than the sum of its proper divisors (4470289).

2111221220111 is an equidigital number, since it uses as much as digits as its factorization.

2111221220111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4470288.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 2111221220111 its reverse (1110221221112), we get a palindrome (3221442441223).

It can be divided in two parts, 2111221 and 220111, that added together give a palindrome (2331332).

The spelling of 2111221220111 in words is "two trillion, one hundred eleven billion, two hundred twenty-one million, two hundred twenty thousand, one hundred eleven".