13000031231220 has 72 divisors (see below), whose sum is σ = 43018285171680. Its totient is φ = 3151522722240.

The previous prime is 13000031231171. The next prime is 13000031231237. The reversal of 13000031231220 is 2213213000031.

13000031231220 is a `hidden beast` number, since 1 + 300 + 0 + 0 + 31 + 2 + 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 = 13000031231193 and 13000031231202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3282834190 + ... + 3282838149.

It is an arithmetic number, because the mean of its divisors is an integer number (597476182940).

Almost surely, 2^{13000031231220} is an apocalyptic number.

13000031231220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13000031231220 is an abundant number, since it is smaller than the sum of its proper divisors (30018253940460).

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

13000031231220 is a wasteful number, since it uses less digits than its factorization.

13000031231220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6565672365 (or 6565672360 counting only the distinct ones).

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

Adding to 13000031231220 its reverse (2213213000031), we get a palindrome (15213244231251).

The spelling of 13000031231220 in words is "thirteen trillion, thirty-one million, two hundred thirty-one thousand, two hundred twenty".