11121721368 has 128 divisors (see below), whose sum is σ = 30750451200. Its totient is φ = 3337058304.

The previous prime is 11121721327. The next prime is 11121721393. The reversal of 11121721368 is 86312712111.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 884421 + ... + 896907.

It is an arithmetic number, because the mean of its divisors is an integer number (240237900).

Almost surely, 2^11121721368 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11121721368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15375225600).

11121721368 is an abundant number, since it is smaller than the sum of its proper divisors (19628729832).

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

11121721368 is a wasteful number, since it uses less digits than its factorization.

11121721368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12609 (or 12605 counting only the distinct ones).

The product of its digits is 4032, while the sum is 33.

The spelling of 11121721368 in words is "eleven billion, one hundred twenty-one million, seven hundred twenty-one thousand, three hundred sixty-eight".