1121112121 has 4 divisors (see below), whose sum is σ = 1121180544. Its totient is φ = 1121043700.

The previous prime is 1121112101. The next prime is 1121112133. The reversal of 1121112121 is 1212111211.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1212111211 = 17827 ⋅67993.

It is a cyclic number.

It is not a de Polignac number, because 1121112121 - 2⁵ = 1121112089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1121112101) 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, 6576 + ... + 47806.

It is an arithmetic number, because the mean of its divisors is an integer number (280295136).

Almost surely, 2^1121112121 is an apocalyptic number.

It is an amenable number.

1121112121 is a deficient number, since it is larger than the sum of its proper divisors (68423).

1121112121 is an equidigital number, since it uses as much as digits as its factorization.

1121112121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68422.

The product of its digits is 8, while the sum is 13.

The square root of 1121112121 is about 33483.0124242130. The cubic root of 1121112121 is about 1038.8424377175.

Adding to 1121112121 its reverse (1212111211), we get a palindrome (2333223332).

It can be divided in two parts, 11211 and 12121, that multiplied together give a palindrome (135888531).

The spelling of 1121112121 in words is "one billion, one hundred twenty-one million, one hundred twelve thousand, one hundred twenty-one".