11221321320 has 96 divisors (see below), whose sum is σ = 39784698720. Its totient is φ = 2720319360.

The previous prime is 11221321313. The next prime is 11221321327. The reversal of 11221321320 is 2312312211.

11221321320 is a `hidden beast` number, since 1 + 1 + 2 + 21 + 321 + 320 = 666.

It is an interprime number because it is at equal distance from previous prime (11221321313) and next prime (11221321327).

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 = 11221321293 and 11221321302.

It is not an unprimeable number, because it can be changed into a prime (11221321327) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1412874 + ... + 1420793.

It is an arithmetic number, because the mean of its divisors is an integer number (414423945).

Almost surely, 2^11221321320 is an apocalyptic number.

11221321320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11221321320 is an abundant number, since it is smaller than the sum of its proper divisors (28563377400).

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

11221321320 is a wasteful number, since it uses less digits than its factorization.

11221321320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2833695 (or 2833688 counting only the distinct ones).

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

Adding to 11221321320 its reverse (2312312211), we get a palindrome (13533633531).

The spelling of 11221321320 in words is "eleven billion, two hundred twenty-one million, three hundred twenty-one thousand, three hundred twenty".