1111111221121 has 16 divisors (see below), whose sum is σ = 1266674319360. Its totient is φ = 964768903120.

The previous prime is 1111111221119. The next prime is 1111111221191. The reversal of 1111111221121 is 1211221111111.

It is not a de Polignac number, because 1111111221121 - 2¹ = 1111111221119 is a prime.

It is a super-3 number, since 3×1111111221121³ (a number of 37 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1111111221095 and 1111111221104.

It is not an unprimeable number, because it can be changed into a prime (1111111221191) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3042241 + ... + 3387838.

It is an arithmetic number, because the mean of its divisors is an integer number (79167144960).

Almost surely, 2^{1111111221121} is an apocalyptic number.

1111111221121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1111111221121 is a deficient number, since it is larger than the sum of its proper divisors (155563098239).

1111111221121 is a wasteful number, since it uses less digits than its factorization.

1111111221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6430796.

The product of its digits is 8, while the sum is 16.

Adding to 1111111221121 its reverse (1211221111111), we get a palindrome (2322332332232).

The spelling of 1111111221121 in words is "one trillion, one hundred eleven billion, one hundred eleven million, two hundred twenty-one thousand, one hundred twenty-one".