11111221044 has 72 divisors (see below), whose sum is σ = 35017190208. Its totient is φ = 2886030720.

The previous prime is 11111221013. The next prime is 11111221049. The reversal of 11111221044 is 44012211111.

11111221044 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111221049) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 2001417 + ... + 2006960.

It is an arithmetic number, because the mean of its divisors is an integer number (486349864).

Almost surely, 2^11111221044 is an apocalyptic number.

11111221044 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

11111221044 is an abundant number, since it is smaller than the sum of its proper divisors (23905969164).

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

11111221044 is a wasteful number, since it uses less digits than its factorization.

11111221044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4008405 (or 4008400 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 11111221044 its reverse (44012211111), we get a palindrome (55123432155).

The spelling of 11111221044 in words is "eleven billion, one hundred eleven million, two hundred twenty-one thousand, forty-four".