13331111220 has 144 divisors (see below), whose sum is σ = 47926290048. Its totient is φ = 3047103360.

The previous prime is 13331111219. The next prime is 13331111267. The reversal of 13331111220 is 2211113331.

13331111220 is a `hidden beast` number, since 1 + 3 + 331 + 111 + 220 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 13331111193 and 13331111202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 161911 + ... + 229950.

Almost surely, 2^13331111220 is an apocalyptic number.

13331111220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13331111220 is an abundant number, since it is smaller than the sum of its proper divisors (34595178828).

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

13331111220 is a wasteful number, since it uses less digits than its factorization.

13331111220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391892 (or 391878 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 13331111220 its reverse (2211113331), we get a palindrome (15542224551).

It can be divided in two parts, 1333111 and 1220, that added together give a palindrome (1334331).

The spelling of 13331111220 in words is "thirteen billion, three hundred thirty-one million, one hundred eleven thousand, two hundred twenty".