13013231220 has 144 divisors (see below), whose sum is σ = 43978491648. Its totient is φ = 3087578880.

The previous prime is 13013231207. The next prime is 13013231239. The reversal of 13013231220 is 2213231031.

13013231220 is a `hidden beast` number, since 1 + 301 + 32 + 312 + 20 = 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 = 13013231193 and 13013231202.

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, 23142 + ... + 162978.

It is an arithmetic number, because the mean of its divisors is an integer number (305406192).

Almost surely, 2^13013231220 is an apocalyptic number.

13013231220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13013231220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21989245824).

13013231220 is an abundant number, since it is smaller than the sum of its proper divisors (30965260428).

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

13013231220 is a wasteful number, since it uses less digits than its factorization.

13013231220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139910 (or 139905 counting only the distinct ones).

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

Adding to 13013231220 its reverse (2213231031), we get a palindrome (15226462251).

The spelling of 13013231220 in words is "thirteen billion, thirteen million, two hundred thirty-one thousand, two hundred twenty".