11021220 has 72 divisors (see below), whose sum is σ = 38211264. Its totient is φ = 2518848.

The previous prime is 11021183. The next prime is 11021249. The reversal of 11021220 is 2212011.

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 23 ways as a sum of consecutive naturals, for example, 3114 + ... + 5633.

It is an arithmetic number, because the mean of its divisors is an integer number (530712).

Almost surely, 2^11021220 is an apocalyptic number.

11021220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11021220 is an abundant number, since it is smaller than the sum of its proper divisors (27190044).

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

11021220 is a wasteful number, since it uses less digits than its factorization.

11021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8769 (or 8764 counting only the distinct ones).

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

The square root of 11021220 is about 3319.8222844002. The cubic root of 11021220 is about 222.5409258556.

Adding to 11021220 its reverse (2212011), we get a palindrome (13233231).

The spelling of 11021220 in words is "eleven million, twenty-one thousand, two hundred twenty".