1111312220 has 12 divisors (see below), whose sum is σ = 2333755704. Its totient is φ = 444524880.

The previous prime is 1111312201. The next prime is 1111312247. The reversal of 1111312220 is 222131111.

It is a junction number, because it is equal to n+sod(n) for n = 1111312195 and 1111312204.

It is a congruent number.

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, 27782786 + ... + 27782825.

It is an arithmetic number, because the mean of its divisors is an integer number (194479642).

Almost surely, 2^1111312220 is an apocalyptic number.

1111312220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1111312220 is an abundant number, since it is smaller than the sum of its proper divisors (1222443484).

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

1111312220 is a wasteful number, since it uses less digits than its factorization.

1111312220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55565620 (or 55565618 counting only the distinct ones).

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

The square root of 1111312220 is about 33336.3498301779. The cubic root of 1111312220 is about 1035.8066540892.

Adding to 1111312220 its reverse (222131111), we get a palindrome (1333443331).

The spelling of 1111312220 in words is "one billion, one hundred eleven million, three hundred twelve thousand, two hundred twenty".