11221540 has 36 divisors (see below), whose sum is σ = 25907868. Its totient is φ = 4079680.

The previous prime is 11221523. The next prime is 11221549. The reversal of 11221540 is 4512211.

It can be written as a sum of positive squares in 2 ways, for example, as 3415104 + 7806436 = 1848^2 + 2794^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11221549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 102 + ... + 4738.

It is an arithmetic number, because the mean of its divisors is an integer number (719663).

Almost surely, 2^11221540 is an apocalyptic number.

11221540 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 11221540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12953934).

11221540 is an abundant number, since it is smaller than the sum of its proper divisors (14686328).

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

11221540 is a wasteful number, since it uses less digits than its factorization.

11221540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4668 (or 4655 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 11221540 is about 3349.8567133536. The cubic root of 11221540 is about 223.8811284679.

Adding to 11221540 its reverse (4512211), we get a palindrome (15733751).

It can be divided in two parts, 1122 and 1540, that added together give a palindrome (2662).

The spelling of 11221540 in words is "eleven million, two hundred twenty-one thousand, five hundred forty".