11111111101220 has 48 divisors (see below), whose sum is σ = 26606334828528. Its totient is φ = 3861236797440.

The previous prime is 11111111101187. The next prime is 11111111101229. The reversal of 11111111101220 is 2210111111111.

It can be written as a sum of positive squares in 8 ways, for example, as 2289308198116 + 8821802903104 = 1513046^2 + 2970152^2 .

It is a junction number, because it is equal to n+sod(n) for n = 11111111101195 and 11111111101204.

It is not an unprimeable number, because it can be changed into a prime (11111111101229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1256908601 + ... + 1256917440.

It is an arithmetic number, because the mean of its divisors is an integer number (554298642261).

Almost surely, 2^{11111111101220} is an apocalyptic number.

11111111101220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11111111101220 is an abundant number, since it is smaller than the sum of its proper divisors (15495223727308).

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

11111111101220 is a wasteful number, since it uses less digits than its factorization.

11111111101220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2513826080 (or 2513826078 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 14.

Adding to 11111111101220 its reverse (2210111111111), we get a palindrome (13321222212331).

The spelling of 11111111101220 in words is "eleven trillion, one hundred eleven billion, one hundred eleven million, one hundred one thousand, two hundred twenty".