11111121240 has 64 divisors (see below), whose sum is σ = 33363295200. Its totient is φ = 2960305152.

The previous prime is 11111121211. The next prime is 11111121247. The reversal of 11111121240 is 4212111111.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111121247) 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 15 ways as a sum of consecutive naturals, for example, 94474 + ... + 176486.

Almost surely, 2^11111121240 is an apocalyptic number.

11111121240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11111121240 is an abundant number, since it is smaller than the sum of its proper divisors (22252173960).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11111121240 is a wasteful number, since it uses less digits than its factorization.

11111121240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83156 (or 83152 counting only the distinct ones).

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

Adding to 11111121240 its reverse (4212111111), we get a palindrome (15323232351).

The spelling of 11111121240 in words is "eleven billion, one hundred eleven million, one hundred twenty-one thousand, two hundred forty".