13020231331 has 16 divisors (see below), whose sum is σ = 13298302080. Its totient is φ = 12745437120.

The previous prime is 13020231317. The next prime is 13020231359. The reversal of 13020231331 is 13313202031.

It is a cyclic number.

It is not a de Polignac number, because 13020231331 - 2¹⁵ = 13020198563 is a prime.

It is a super-2 number, since 2×13020231331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13020231299 and 13020231308.

It is not an unprimeable number, because it can be changed into a prime (13020231361) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8778916 + ... + 8780398.

It is an arithmetic number, because the mean of its divisors is an integer number (831143880).

Almost surely, 2^13020231331 is an apocalyptic number.

13020231331 is a deficient number, since it is larger than the sum of its proper divisors (278070749).

13020231331 is a wasteful number, since it uses less digits than its factorization.

13020231331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2466.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 13020231331 its reverse (13313202031), we get a palindrome (26333433362).

The spelling of 13020231331 in words is "thirteen billion, twenty million, two hundred thirty-one thousand, three hundred thirty-one".