1111123121 has 4 divisors (see below), whose sum is σ = 1117545972. Its totient is φ = 1104700272.

The previous prime is 1111123093. The next prime is 1111123133. The reversal of 1111123121 is 1213211111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1080042496 + 31080625 = 32864^2 + 5575^2 .

It is a cyclic number.

It is not a de Polignac number, because 1111123121 - 2¹⁸ = 1110860977 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1111123096 and 1111123105.

It is not an unprimeable number, because it can be changed into a prime (1111123141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3211166 + ... + 3211511.

It is an arithmetic number, because the mean of its divisors is an integer number (279386493).

Almost surely, 2^1111123121 is an apocalyptic number.

It is an amenable number.

1111123121 is a deficient number, since it is larger than the sum of its proper divisors (6422851).

1111123121 is an equidigital number, since it uses as much as digits as its factorization.

1111123121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6422850.

The product of its digits is 12, while the sum is 14.

The square root of 1111123121 is about 33333.5134811799. The cubic root of 1111123121 is about 1035.7479003896.

Adding to 1111123121 its reverse (1213211111), we get a palindrome (2324334232).

The spelling of 1111123121 in words is "one billion, one hundred eleven million, one hundred twenty-three thousand, one hundred twenty-one".