11111301220 has 12 divisors (see below), whose sum is σ = 23333732604. Its totient is φ = 4444520480.

The previous prime is 11111301203. The next prime is 11111301221. The reversal of 11111301220 is 2210311111.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2183319076 + 8927982144 = 46726^2 + 94488^2 .

It is a super-2 number, since 2×11111301220² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11111301220.

It is not an unprimeable number, because it can be changed into a prime (11111301221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 277782511 + ... + 277782550.

It is an arithmetic number, because the mean of its divisors is an integer number (1944477717).

Almost surely, 2^11111301220 is an apocalyptic number.

11111301220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11111301220 is an abundant number, since it is smaller than the sum of its proper divisors (12222431384).

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

11111301220 is a wasteful number, since it uses less digits than its factorization.

11111301220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 555565070 (or 555565068 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 11111301220 its reverse (2210311111), we get a palindrome (13321612331).

The spelling of 11111301220 in words is "eleven billion, one hundred eleven million, three hundred one thousand, two hundred twenty".