13244320221 has 32 divisors (see below), whose sum is σ = 19799797248. Its totient is φ = 7805461440.

The previous prime is 13244320189. The next prime is 13244320231. The reversal of 13244320221 is 12202344231.

It is a happy number.

It is not a de Polignac number, because 13244320221 - 2⁵ = 13244320189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13244320191 and 13244320200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13244320231) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 301555 + ... + 342671.

It is an arithmetic number, because the mean of its divisors is an integer number (618743664).

Almost surely, 2^13244320221 is an apocalyptic number.

13244320221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13244320221 is a deficient number, since it is larger than the sum of its proper divisors (6555477027).

13244320221 is a wasteful number, since it uses less digits than its factorization.

13244320221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41401.

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

Adding to 13244320221 its reverse (12202344231), we get a palindrome (25446664452).

The spelling of 13244320221 in words is "thirteen billion, two hundred forty-four million, three hundred twenty thousand, two hundred twenty-one".