11111120221220 has 24 divisors (see below), whose sum is σ = 23352780785208. Its totient is φ = 4440747456000.

The previous prime is 11111120221207. The next prime is 11111120221249. The reversal of 11111120221220 is 2212202111111.

It can be written as a sum of positive squares in 4 ways, for example, as 151140557824 + 10959979663396 = 388768^2 + 3310586^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 231264911 + ... + 231312950.

It is an arithmetic number, because the mean of its divisors is an integer number (973032532717).

Almost surely, 2^{11111120221220} is an apocalyptic number.

11111120221220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11111120221220 is an abundant number, since it is smaller than the sum of its proper divisors (12241660563988).

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

11111120221220 is a wasteful number, since it uses less digits than its factorization.

11111120221220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 462579071 (or 462579069 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 11111120221220 its reverse (2212202111111), we get a palindrome (13323322332331).

The spelling of 11111120221220 in words is "eleven trillion, one hundred eleven billion, one hundred twenty million, two hundred twenty-one thousand, two hundred twenty".