13111213220 has 36 divisors (see below), whose sum is σ = 32028823260. Its totient is φ = 4495272768.

The previous prime is 13111213217. The next prime is 13111213231. The reversal of 13111213220 is 2231211131.

It can be written as a sum of positive squares in 2 ways, for example, as 3976059136 + 9135154084 = 63056^2 + 95578^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6688415 + ... + 6690374.

It is an arithmetic number, because the mean of its divisors is an integer number (889689535).

Almost surely, 2^13111213220 is an apocalyptic number.

13111213220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13111213220 is an abundant number, since it is smaller than the sum of its proper divisors (18917610040).

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

13111213220 is a wasteful number, since it uses less digits than its factorization.

13111213220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13378812 (or 13378803 counting only the distinct ones).

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

Adding to 13111213220 its reverse (2231211131), we get a palindrome (15342424351).

The spelling of 13111213220 in words is "thirteen billion, one hundred eleven million, two hundred thirteen thousand, two hundred twenty".