11331221120 has 64 divisors (see below), whose sum is σ = 27120731040. Its totient is φ = 4527129600.

The previous prime is 11331221107. The next prime is 11331221149. The reversal of 11331221120 is 2112213311.

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 555095 + ... + 575145.

Almost surely, 2^11331221120 is an apocalyptic number.

11331221120 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 11331221120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13560365520).

11331221120 is an abundant number, since it is smaller than the sum of its proper divisors (15789509920).

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

11331221120 is an equidigital number, since it uses as much as digits as its factorization.

11331221120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20953 (or 20941 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 11331221120 its reverse (2112213311), we get a palindrome (13443434431).

The spelling of 11331221120 in words is "eleven billion, three hundred thirty-one million, two hundred twenty-one thousand, one hundred twenty".