11031123220 has 48 divisors (see below), whose sum is σ = 25072790400. Its totient is φ = 4052543616.

The previous prime is 11031123161. The next prime is 11031123241. The reversal of 11031123220 is 2232113011.

It is a junction number, because it is equal to n+sod(n) for n = 11031123194 and 11031123203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54862 + ... + 158341.

It is an arithmetic number, because the mean of its divisors is an integer number (522349800).

Almost surely, 2^11031123220 is an apocalyptic number.

11031123220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11031123220 is an abundant number, since it is smaller than the sum of its proper divisors (14041667180).

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

11031123220 is a wasteful number, since it uses less digits than its factorization.

11031123220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213424 (or 213422 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 11031123220 its reverse (2232113011), we get a palindrome (13263236231).

The spelling of 11031123220 in words is "eleven billion, thirty-one million, one hundred twenty-three thousand, two hundred twenty".