11321321220 has 288 divisors, whose sum is σ = 38736681984. Its totient is φ = 2652652800.

The previous prime is 11321321159. The next prime is 11321321227. The reversal of 11321321220 is 2212312311.

11321321220 is a `hidden beast` number, since 1 + 1 + 321 + 321 + 2 + 20 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 11321321193 and 11321321202.

It is not an unprimeable number, because it can be changed into a prime (11321321227) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 8768775 + ... + 8770065.

It is an arithmetic number, because the mean of its divisors is an integer number (134502368).

Almost surely, 2^11321321220 is an apocalyptic number.

11321321220 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 11321321220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19368340992).

11321321220 is an abundant number, since it is smaller than the sum of its proper divisors (27415360764).

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

11321321220 is a wasteful number, since it uses less digits than its factorization.

11321321220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1463 (or 1458 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 11321321220 its reverse (2212312311), we get a palindrome (13533633531).

The spelling of 11321321220 in words is "eleven billion, three hundred twenty-one million, three hundred twenty-one thousand, two hundred twenty".