11111240121 has 4 divisors (see below), whose sum is σ = 14814986832. Its totient is φ = 7407493412.

The previous prime is 11111240117. The next prime is 11111240183. The reversal of 11111240121 is 12104211111.

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 an emirpimes, since its reverse is a distinct semiprime: 12104211111 = 3 ⋅4034737037.

It is a cyclic number.

It is not a de Polignac number, because 11111240121 - 2² = 11111240117 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 11111240121.

It is not an unprimeable number, because it can be changed into a prime (11111240321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1851873351 + ... + 1851873356.

It is an arithmetic number, because the mean of its divisors is an integer number (3703746708).

Almost surely, 2^11111240121 is an apocalyptic number.

It is an amenable number.

11111240121 is a deficient number, since it is larger than the sum of its proper divisors (3703746711).

11111240121 is an equidigital number, since it uses as much as digits as its factorization.

11111240121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3703746710.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 11111240121 its reverse (12104211111), we get a palindrome (23215451232).

The spelling of 11111240121 in words is "eleven billion, one hundred eleven million, two hundred forty thousand, one hundred twenty-one".