2221211211111 has 56 divisors (see below), whose sum is σ = 3450881857280. Its totient is φ = 1428060016656.

The previous prime is 2221211211097. The next prime is 2221211211209. The reversal of 2221211211111 is 1111121121222.

It is a happy number.

2221211211111 is a `hidden beast` number, since 222 + 121 + 1 + 211 + 111 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-2221211211111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221211211211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 2027940 + ... + 2924886.

Almost surely, 2^{2221211211111} is an apocalyptic number.

2221211211111 is a deficient number, since it is larger than the sum of its proper divisors (1229670646169).

2221211211111 is an frugal number, since it uses more digits than its factorization.

2221211211111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 897087 (or 897072 counting only the distinct ones).

The product of its digits is 32, while the sum is 18.

Adding to 2221211211111 its reverse (1111121121222), we get a palindrome (3332332332333).

The spelling of 2221211211111 in words is "two trillion, two hundred twenty-one billion, two hundred eleven million, two hundred eleven thousand, one hundred eleven".