13221203444 has 12 divisors (see below), whose sum is σ = 23150736000. Its totient is φ = 6606707448.

The previous prime is 13221203431. The next prime is 13221203453. The reversal of 13221203444 is 44430212231.

It is a super-2 number, since 2×13221203444² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 965924 + ... + 979515.

It is an arithmetic number, because the mean of its divisors is an integer number (1929228000).

Almost surely, 2^13221203444 is an apocalyptic number.

It is an amenable number.

13221203444 is a deficient number, since it is larger than the sum of its proper divisors (9929532556).

13221203444 is a wasteful number, since it uses less digits than its factorization.

13221203444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1947142 (or 1947140 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 13221203444 its reverse (44430212231), we get a palindrome (57651415675).

The spelling of 13221203444 in words is "thirteen billion, two hundred twenty-one million, two hundred three thousand, four hundred forty-four".