22011111221111 has 4 divisors (see below), whose sum is σ = 22011121082592. Its totient is φ = 22011101359632.

The previous prime is 22011111221087. The next prime is 22011111221161. The reversal of 22011111221111 is 11112211111022.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22011111221111 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 22011111221111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22011111221161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189971 + ... + 6637643.

It is an arithmetic number, because the mean of its divisors is an integer number (5502780270648).

Almost surely, 2^{22011111221111} is an apocalyptic number.

22011111221111 is a deficient number, since it is larger than the sum of its proper divisors (9861481).

22011111221111 is an equidigital number, since it uses as much as digits as its factorization.

22011111221111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9861480.

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

Adding to 22011111221111 its reverse (11112211111022), we get a palindrome (33123322332133).

The spelling of 22011111221111 in words is "twenty-two trillion, eleven billion, one hundred eleven million, two hundred twenty-one thousand, one hundred eleven".