1111111112121 has 8 divisors (see below), whose sum is σ = 1481760870720. Its totient is φ = 740601047472.

The previous prime is 1111111112099. The next prime is 1111111112141. The reversal of 1111111112121 is 1212111111111.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1111111112121 - 2¹¹ = 1111111110073 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1111111112121.

It is not an unprimeable number, because it can be changed into a prime (1111111112141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34904926 + ... + 34936743.

It is an arithmetic number, because the mean of its divisors is an integer number (185220108840).

Almost surely, 2^{1111111112121} is an apocalyptic number.

It is an amenable number.

1111111112121 is a deficient number, since it is larger than the sum of its proper divisors (370649758599).

1111111112121 is an equidigital number, since it uses as much as digits as its factorization.

1111111112121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69846975.

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

Adding to 1111111112121 its reverse (1212111111111), we get a palindrome (2323222223232).

It can be divided in two parts, 11111111 and 12121, that multiplied together give a palindrome (134677776431).

The spelling of 1111111112121 in words is "one trillion, one hundred eleven billion, one hundred eleven million, one hundred twelve thousand, one hundred twenty-one".