1113121220 has 48 divisors (see below), whose sum is σ = 2418958080. Its totient is φ = 429977856.

The previous prime is 1113121201. The next prime is 1113121231. The reversal of 1113121220 is 221213111.

It is a junction number, because it is equal to n+sod(n) for n = 1113121195 and 1113121204.

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, 69269 + ... + 83811.

It is an arithmetic number, because the mean of its divisors is an integer number (50394960).

Almost surely, 2^1113121220 is an apocalyptic number.

1113121220 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 1113121220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1209479040).

1113121220 is an abundant number, since it is smaller than the sum of its proper divisors (1305836860).

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

1113121220 is a wasteful number, since it uses less digits than its factorization.

1113121220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14684 (or 14682 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 1113121220 is about 33363.4713421730. The cubic root of 1113121220 is about 1036.3683799507.

Adding to 1113121220 its reverse (221213111), we get a palindrome (1334334331).

The spelling of 1113121220 in words is "one billion, one hundred thirteen million, one hundred twenty-one thousand, two hundred twenty".