1111221111 has 128 divisors (see below), whose sum is σ = 2086189056. Its totient is φ = 507617280.

The previous prime is 1111221109. The next prime is 1111221113.

1111221111 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (1111221109) and next prime (1111221113).

It is not a de Polignac number, because 1111221111 - 2¹ = 1111221109 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 (1111221113) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 8111035 + ... + 8111171.

It is an arithmetic number, because the mean of its divisors is an integer number (16298352).

Almost surely, 2^1111221111 is an apocalyptic number.

1111221111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1111221111 is a deficient number, since it is larger than the sum of its proper divisors (974967945).

1111221111 is a wasteful number, since it uses less digits than its factorization.

1111221111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281.

The product of its digits is 4, while the sum is 12.

The square root of 1111221111 is about 33334.9832908313. The cubic root of 1111221111 is about 1035.7783470465.

It can be divided in two parts, 11112 and 21111, that multiplied together give a palindrome (234585432).

The spelling of 1111221111 in words is "one billion, one hundred eleven million, two hundred twenty-one thousand, one hundred eleven".