13220031444 has 12 divisors (see below), whose sum is σ = 30846740064. Its totient is φ = 4406677144.

The previous prime is 13220031443. The next prime is 13220031449. The reversal of 13220031444 is 44413002231.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13220031443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 550834632 + ... + 550834655.

It is an arithmetic number, because the mean of its divisors is an integer number (2570561672).

Almost surely, 2^13220031444 is an apocalyptic number.

It is an amenable number.

13220031444 is an abundant number, since it is smaller than the sum of its proper divisors (17626708620).

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

13220031444 is a wasteful number, since it uses less digits than its factorization.

13220031444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1101669294 (or 1101669292 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 13220031444 its reverse (44413002231), we get a palindrome (57633033675).

The spelling of 13220031444 in words is "thirteen billion, two hundred twenty million, thirty-one thousand, four hundred forty-four".