13044442221 has 18 divisors (see below), whose sum is σ = 18900497070. Its totient is φ = 8669366640.

The previous prime is 13044442217. The next prime is 13044442231. The reversal of 13044442221 is 12224444031.

It can be written as a sum of positive squares in only one way, i.e., 13040498025 + 3944196 = 114195^2 + 1986^2 .

It is not a de Polignac number, because 13044442221 - 2² = 13044442217 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13044442231) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 979435 + ... + 992663.

It is an arithmetic number, because the mean of its divisors is an integer number (1050027615).

Almost surely, 2^13044442221 is an apocalyptic number.

It is an amenable number.

13044442221 is a deficient number, since it is larger than the sum of its proper divisors (5856054849).

13044442221 is an equidigital number, since it uses as much as digits as its factorization.

13044442221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13897 (or 13563 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

Adding to 13044442221 its reverse (12224444031), we get a palindrome (25268886252).

The spelling of 13044442221 in words is "thirteen billion, forty-four million, four hundred forty-two thousand, two hundred twenty-one".