11121220 has 24 divisors (see below), whose sum is σ = 25478208. Its totient is φ = 4044000.

The previous prime is 11121217. The next prime is 11121223. The reversal of 11121220 is 2212111.

It is an interprime number because it is at equal distance from previous prime (11121217) and next prime (11121223).

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 11121197 and 11121206.

It is not an unprimeable number, because it can be changed into a prime (11121223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25056 + ... + 25495.

It is an arithmetic number, because the mean of its divisors is an integer number (1061592).

Almost surely, 2^11121220 is an apocalyptic number.

11121220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11121220 is an abundant number, since it is smaller than the sum of its proper divisors (14356988).

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

11121220 is a wasteful number, since it uses less digits than its factorization.

11121220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50571 (or 50569 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 11121220 is about 3334.8493219335. The cubic root of 11121220 is about 223.2119684148.

Adding to 11121220 its reverse (2212111), we get a palindrome (13333331).

It can be divided in two parts, 1112 and 1220, that added together give a palindrome (2332).

The spelling of 11121220 in words is "eleven million, one hundred twenty-one thousand, two hundred twenty".