11111320320 has 144 divisors (see below), whose sum is σ = 35638202880. Its totient is φ = 2950377472.

The previous prime is 11111320313. The next prime is 11111320351. The reversal of 11111320320 is 2302311111.

It is a happy number.

It is a super-2 number, since 2×11111320320² (a number of 21 digits) contains 22 as substring.

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

It is a self number, because there is not a number n which added to its sum of digits gives 11111320320.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 911707 + ... + 923813.

It is an arithmetic number, because the mean of its divisors is an integer number (247487520).

Almost surely, 2^11111320320 is an apocalyptic number.

11111320320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11111320320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17819101440).

11111320320 is an abundant number, since it is smaller than the sum of its proper divisors (24526882560).

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

11111320320 is a wasteful number, since it uses less digits than its factorization.

11111320320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12370 (or 12356 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 11111320320 its reverse (2302311111), we get a palindrome (13413631431).

The spelling of 11111320320 in words is "eleven billion, one hundred eleven million, three hundred twenty thousand, three hundred twenty".