1111111221111 has 32 divisors (see below), whose sum is σ = 1550775744000. Its totient is φ = 706929482880.

The previous prime is 1111111221109. The next prime is 1111111221119. The reversal of 1111111221111 is 1111221111111.

It is a happy number.

It is not a de Polignac number, because 1111111221111 - 2¹ = 1111111221109 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 (1111111221119) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2202240 + ... + 2659338.

It is an arithmetic number, because the mean of its divisors is an integer number (48461742000).

Almost surely, 2^{1111111221111} is an apocalyptic number.

1111111221111 is a deficient number, since it is larger than the sum of its proper divisors (439664522889).

1111111221111 is a wasteful number, since it uses less digits than its factorization.

1111111221111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457559.

The product of its digits is 4, while the sum is 15.

Adding to 1111111221111 its reverse (1111221111111), we get a palindrome (2222332332222).

It can be divided in two parts, 111 and 1111221111, that multiplied together give a palindrome (123345543321).

The spelling of 1111111221111 in words is "one trillion, one hundred eleven billion, one hundred eleven million, two hundred twenty-one thousand, one hundred eleven".