1011111220 has 48 divisors (see below), whose sum is σ = 2554392960. Its totient is φ = 328420224.

The previous prime is 1011111203. The next prime is 1011111253. The reversal of 1011111220 is 221111101.

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 = 1011111197 and 1011111206.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 187399 + ... + 192718.

It is an arithmetic number, because the mean of its divisors is an integer number (53216520).

Almost surely, 2^1011111220 is an apocalyptic number.

1011111220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1011111220 is an abundant number, since it is smaller than the sum of its proper divisors (1543281740).

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

1011111220 is a wasteful number, since it uses less digits than its factorization.

1011111220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380152 (or 380150 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 10.

The square root of 1011111220 is about 31797.9750927634. The cubic root of 1011111220 is about 1003.6901063658.

Adding to 1011111220 its reverse (221111101), we get a palindrome (1232222321).

The spelling of 1011111220 in words is "one billion, eleven million, one hundred eleven thousand, two hundred twenty".