2011101220 has 12 divisors (see below), whose sum is σ = 4223312604. Its totient is φ = 804440480.

The previous prime is 2011101179. The next prime is 2011101221. The reversal of 2011101220 is 221011102.

It can be written as a sum of positive squares in 2 ways, for example, as 620109604 + 1390991616 = 24902^2 + 37296^2 .

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 = 2011101197 and 2011101206.

It is not an unprimeable number, because it can be changed into a prime (2011101221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50277511 + ... + 50277550.

It is an arithmetic number, because the mean of its divisors is an integer number (351942717).

Almost surely, 2^2011101220 is an apocalyptic number.

2011101220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2011101220 is an abundant number, since it is smaller than the sum of its proper divisors (2212211384).

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

2011101220 is a wasteful number, since it uses less digits than its factorization.

2011101220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100555070 (or 100555068 counting only the distinct ones).

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

The square root of 2011101220 is about 44845.3032100353. The cubic root of 2011101220 is about 1262.2478602443.

Adding to 2011101220 its reverse (221011102), we get a palindrome (2232112322).

The spelling of 2011101220 in words is "two billion, eleven million, one hundred one thousand, two hundred twenty".