11223231220 has 24 divisors (see below), whose sum is σ = 24809248800. Its totient is φ = 4253013792.

The previous prime is 11223231197. The next prime is 11223231221. The reversal of 11223231220 is 2213232211.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11223231221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14767030 + ... + 14767789.

It is an arithmetic number, because the mean of its divisors is an integer number (1033718700).

Almost surely, 2^11223231220 is an apocalyptic number.

11223231220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11223231220 is an abundant number, since it is smaller than the sum of its proper divisors (13586017580).

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

11223231220 is a wasteful number, since it uses less digits than its factorization.

11223231220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29534847 (or 29534845 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 11223231220 its reverse (2213232211), we get a palindrome (13436463431).

Subtracting from 11223231220 its reverse (2213232211), we obtain a palindrome (9009999009).

The spelling of 11223231220 in words is "eleven billion, two hundred twenty-three million, two hundred thirty-one thousand, two hundred twenty".