11131312220 has 48 divisors (see below), whose sum is σ = 27366752448. Its totient is φ = 3723363840.

The previous prime is 11131312183. The next prime is 11131312229. The reversal of 11131312220 is 2221313111.

It is a super-2 number, since 2×11131312220² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11131312229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 963887 + ... + 975366.

It is an arithmetic number, because the mean of its divisors is an integer number (570140676).

Almost surely, 2^11131312220 is an apocalyptic number.

11131312220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11131312220 is an abundant number, since it is smaller than the sum of its proper divisors (16235440228).

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

11131312220 is a wasteful number, since it uses less digits than its factorization.

11131312220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1939310 (or 1939308 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 11131312220 its reverse (2221313111), we get a palindrome (13352625331).

The spelling of 11131312220 in words is "eleven billion, one hundred thirty-one million, three hundred twelve thousand, two hundred twenty".