11121231121 has 72 divisors (see below), whose sum is σ = 15560897856. Its totient is φ = 7733880000.

The previous prime is 11121231103. The next prime is 11121231151. The reversal of 11121231121 is 12113212111.

It is a happy number.

It is not a de Polignac number, because 11121231121 - 2⁵ = 11121231089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11121231095 and 11121231104.

It is not an unprimeable number, because it can be changed into a prime (11121231151) 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 71 ways as a sum of consecutive naturals, for example, 10581046 + ... + 10582096.

Almost surely, 2^11121231121 is an apocalyptic number.

11121231121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11121231121 is a deficient number, since it is larger than the sum of its proper divisors (4439666735).

11121231121 is a wasteful number, since it uses less digits than its factorization.

11121231121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1155 (or 1113 counting only the distinct ones).

The product of its digits is 24, while the sum is 16.

Adding to 11121231121 its reverse (12113212111), we get a palindrome (23234443232).

It can be divided in two parts, 11121 and 231121, that added together give a palindrome (242242).

The spelling of 11121231121 in words is "eleven billion, one hundred twenty-one million, two hundred thirty-one thousand, one hundred twenty-one".