11220452520 has 128 divisors (see below), whose sum is σ = 34209302400. Its totient is φ = 2943811584.

The previous prime is 11220452473. The next prime is 11220452521. The reversal of 11220452520 is 2525402211.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (11220452521) 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, 1881864 + ... + 1887816.

It is an arithmetic number, because the mean of its divisors is an integer number (267260175).

Almost surely, 2^11220452520 is an apocalyptic number.

11220452520 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 11220452520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17104651200).

11220452520 is an abundant number, since it is smaller than the sum of its proper divisors (22988849880).

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

11220452520 is a wasteful number, since it uses less digits than its factorization.

11220452520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6219 (or 6215 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 24.

Adding to 11220452520 its reverse (2525402211), we get a palindrome (13745854731).

The spelling of 11220452520 in words is "eleven billion, two hundred twenty million, four hundred fifty-two thousand, five hundred twenty".