2221121111111 has 8 divisors (see below), whose sum is σ = 2538493127040. Its totient is φ = 1903766345208.

The previous prime is 2221121111081. The next prime is 2221121111113. The reversal of 2221121111111 is 1111111211222.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2221121111111 - 2¹⁴ = 2221121094727 is a prime.

It is a Duffinian number.

2221121111111 is a modest number, since divided by 1111111 gives 222112 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 2221121111111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221121111113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4035401 + ... + 4552658.

It is an arithmetic number, because the mean of its divisors is an integer number (317311640880).

Almost surely, 2^{2221121111111} is an apocalyptic number.

2221121111111 is a deficient number, since it is larger than the sum of its proper divisors (317372015929).

2221121111111 is an equidigital number, since it uses as much as digits as its factorization.

2221121111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8625013.

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

Adding to 2221121111111 its reverse (1111111211222), we get a palindrome (3332232322333).

The spelling of 2221121111111 in words is "two trillion, two hundred twenty-one billion, one hundred twenty-one million, one hundred eleven thousand, one hundred eleven".