13011233220 has 72 divisors (see below), whose sum is σ = 41789029464. Its totient is φ = 3265563648.

The previous prime is 13011233143. The next prime is 13011233227. The reversal of 13011233220 is 2233211031.

13011233220 is a `hidden beast` number, since 1 + 301 + 12 + 332 + 20 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 4322010564 + 8689222656 = 65742^2 + 93216^2 .

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 = 13011233193 and 13011233202.

It is not an unprimeable number, because it can be changed into a prime (13011233227) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2122959 + ... + 2129078.

It is an arithmetic number, because the mean of its divisors is an integer number (580403187).

Almost surely, 2^13011233220 is an apocalyptic number.

13011233220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13011233220 is an abundant number, since it is smaller than the sum of its proper divisors (28777796244).

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

13011233220 is a wasteful number, since it uses less digits than its factorization.

13011233220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4252069 (or 4252064 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 13011233220 its reverse (2233211031), we get a palindrome (15244444251).

The spelling of 13011233220 in words is "thirteen billion, eleven million, two hundred thirty-three thousand, two hundred twenty".