2011111111220 has 12 divisors (see below), whose sum is σ = 4223333333604. Its totient is φ = 804444444480.

The previous prime is 2011111111201. The next prime is 2011111111277. The reversal of 2011111111220 is 221111111102.

It can be written as a sum of positive squares in 2 ways, for example, as 694028951056 + 1317082160164 = 833084^2 + 1147642^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2011111111195 and 2011111111204.

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, 50277777761 + ... + 50277777800.

It is an arithmetic number, because the mean of its divisors is an integer number (351944444467).

Almost surely, 2^{2011111111220} is an apocalyptic number.

2011111111220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2011111111220 is an abundant number, since it is smaller than the sum of its proper divisors (2212222222384).

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

2011111111220 is a wasteful number, since it uses less digits than its factorization.

2011111111220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100555555570 (or 100555555568 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 2011111111220 its reverse (221111111102), we get a palindrome (2232222222322).

The spelling of 2011111111220 in words is "two trillion, eleven billion, one hundred eleven million, one hundred eleven thousand, two hundred twenty".