13212320331 has 16 divisors (see below), whose sum is σ = 20164986368. Its totient is φ = 7537924800.

The previous prime is 13212320323. The next prime is 13212320333. The reversal of 13212320331 is 13302321231.

It is not a de Polignac number, because 13212320331 - 2³ = 13212320323 is a prime.

It is a super-2 number, since 2×13212320331² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13212320298 and 13212320307.

It is not an unprimeable number, because it can be changed into a prime (13212320333) 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, 485290 + ... + 511791.

It is an arithmetic number, because the mean of its divisors is an integer number (1260311648).

Almost surely, 2^13212320331 is an apocalyptic number.

13212320331 is a deficient number, since it is larger than the sum of its proper divisors (6952666037).

13212320331 is an equidigital number, since it uses as much as digits as its factorization.

13212320331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 997722.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 13212320331 its reverse (13302321231), we get a palindrome (26514641562).

The spelling of 13212320331 in words is "thirteen billion, two hundred twelve million, three hundred twenty thousand, three hundred thirty-one".