11131311220 has 24 divisors (see below), whose sum is σ = 23816807784. Its totient is φ = 4368514176.

The previous prime is 11131311197. The next prime is 11131311271. The reversal of 11131311220 is 2211313111.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 626701156 + 10504610064 = 25034^2 + 102492^2 .

It is a junction number, because it is equal to n+sod(n) for n = 11131311194 and 11131311203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5249559 + ... + 5251678.

It is an arithmetic number, because the mean of its divisors is an integer number (992366991).

Almost surely, 2^11131311220 is an apocalyptic number.

11131311220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11131311220 is an abundant number, since it is smaller than the sum of its proper divisors (12685496564).

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

11131311220 is a wasteful number, since it uses less digits than its factorization.

11131311220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10501299 (or 10501297 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 11131311220 its reverse (2211313111), we get a palindrome (13342624331).

The spelling of 11131311220 in words is "eleven billion, one hundred thirty-one million, three hundred eleven thousand, two hundred twenty".