11381021320 has 128 divisors (see below), whose sum is σ = 27005414400. Its totient is φ = 4311014400.

The previous prime is 11381021317. The next prime is 11381021321. The reversal of 11381021320 is 2312018311.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 11381021291 and 11381021300.

It is not an unprimeable number, because it can be changed into a prime (11381021321) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28667362 + ... + 28667758.

It is an arithmetic number, because the mean of its divisors is an integer number (210979800).

Almost surely, 2^11381021320 is an apocalyptic number.

11381021320 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 11381021320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13502707200).

11381021320 is an abundant number, since it is smaller than the sum of its proper divisors (15624393080).

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

11381021320 is a wasteful number, since it uses less digits than its factorization.

11381021320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 879 (or 875 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 11381021320 its reverse (2312018311), we get a palindrome (13693039631).

The spelling of 11381021320 in words is "eleven billion, three hundred eighty-one million, twenty-one thousand, three hundred twenty".