11201220 has 48 divisors (see below), whose sum is σ = 34849920. Its totient is φ = 2986848.

The previous prime is 11201219. The next prime is 11201233. The reversal of 11201220 is 2210211.

11201220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9832 + ... + 10911.

It is an arithmetic number, because the mean of its divisors is an integer number (726040).

Almost surely, 2^11201220 is an apocalyptic number.

11201220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11201220 is an abundant number, since it is smaller than the sum of its proper divisors (23648700).

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

11201220 is a wasteful number, since it uses less digits than its factorization.

11201220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20761 (or 20753 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 11201220 is about 3346.8223735358. The cubic root of 11201220 is about 223.7459119339.

Adding to 11201220 its reverse (2210211), we get a palindrome (13411431).

The spelling of 11201220 in words is "eleven million, two hundred one thousand, two hundred twenty".