11221220 has 12 divisors (see below), whose sum is σ = 23564604. Its totient is φ = 4488480.

The previous prime is 11221219. The next prime is 11221247. The reversal of 11221220 is 2212211.

It is a happy number.

11221220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 6031936 + 5189284 = 2456^2 + 2278^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 280511 + ... + 280550.

It is an arithmetic number, because the mean of its divisors is an integer number (1963717).

Almost surely, 2^11221220 is an apocalyptic number.

11221220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11221220 is an abundant number, since it is smaller than the sum of its proper divisors (12343384).

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

11221220 is a wasteful number, since it uses less digits than its factorization.

11221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561070 (or 561068 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 11221220 is about 3349.8089497761. The cubic root of 11221220 is about 223.8790003393.

Adding to 11221220 its reverse (2212211), we get a palindrome (13433431).

Subtracting from 11221220 its reverse (2212211), we obtain a palindrome (9009009).

It can be divided in two parts, 1 and 1221220, that added together give a palindrome (1221221).

The spelling of 11221220 in words is "eleven million, two hundred twenty-one thousand, two hundred twenty".