11781121112 has 32 divisors (see below), whose sum is σ = 22521920400. Its totient is φ = 5775429504.

The previous prime is 11781121103. The next prime is 11781121199. The reversal of 11781121112 is 21112118711.

11781121112 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×11781121112² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 660698 + ... + 678294.

Almost surely, 2^11781121112 is an apocalyptic number.

It is an amenable number.

11781121112 is a deficient number, since it is larger than the sum of its proper divisors (10740799288).

11781121112 is a wasteful number, since it uses less digits than its factorization.

11781121112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19235 (or 19231 counting only the distinct ones).

The product of its digits is 224, while the sum is 26.

Adding to 11781121112 its reverse (21112118711), we get a palindrome (32893239823).

The spelling of 11781121112 in words is "eleven billion, seven hundred eighty-one million, one hundred twenty-one thousand, one hundred twelve".