1111222221111 has 48 divisors (see below), whose sum is σ = 1683264302304. Its totient is φ = 705727613952.

The previous prime is 1111222221097. The next prime is 1111222221127.

It is a happy number.

1111222221111 is a `hidden beast` number, since 1 + 111 + 222 + 221 + 111 = 666.

1111222221111 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1111222221111 - 2¹⁴ = 1111222204727 is a prime.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111222221181) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3163500 + ... + 3497166.

It is an arithmetic number, because the mean of its divisors is an integer number (35068006298).

Almost surely, 2^{1111222221111} is an apocalyptic number.

1111222221111 is a deficient number, since it is larger than the sum of its proper divisors (572042081193).

1111222221111 is a wasteful number, since it uses less digits than its factorization.

1111222221111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333920 (or 333917 counting only the distinct ones).

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

It can be divided in two parts, 1111 and 222221111, that added together give a palindrome (222222222).

The spelling of 1111222221111 in words is "one trillion, one hundred eleven billion, two hundred twenty-two million, two hundred twenty-one thousand, one hundred eleven".