11221280 has 96 divisors (see below), whose sum is σ = 31135104. Its totient is φ = 3741696.

The previous prime is 11221253. The next prime is 11221283. The reversal of 11221280 is 8212211.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11221283) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48044 + ... + 48276.

It is an arithmetic number, because the mean of its divisors is an integer number (324324).

Almost surely, 2^11221280 is an apocalyptic number.

11221280 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 11221280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15567552).

11221280 is an abundant number, since it is smaller than the sum of its proper divisors (19913824).

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

11221280 is a wasteful number, since it uses less digits than its factorization.

11221280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298 (or 290 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

The square root of 11221280 is about 3349.8179054987. The cubic root of 11221280 is about 223.8793993665.

Adding to 11221280 its reverse (8212211), we get a palindrome (19433491).

The spelling of 11221280 in words is "eleven million, two hundred twenty-one thousand, two hundred eighty".