11111443220 has 48 divisors (see below), whose sum is σ = 23648620800. Its totient is φ = 4384748160.

The previous prime is 11111443207. The next prime is 11111443229. The reversal of 11111443220 is 2234411111.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 11111443192 and 11111443201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111443229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2824655 + ... + 2828585.

It is an arithmetic number, because the mean of its divisors is an integer number (492679600).

Almost surely, 2^11111443220 is an apocalyptic number.

11111443220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11111443220 is an abundant number, since it is smaller than the sum of its proper divisors (12537177580).

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

11111443220 is a wasteful number, since it uses less digits than its factorization.

11111443220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5808 (or 5806 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 11111443220 its reverse (2234411111), we get a palindrome (13345854331).

The spelling of 11111443220 in words is "eleven billion, one hundred eleven million, four hundred forty-three thousand, two hundred twenty".