13444221 has 16 divisors (see below), whose sum is σ = 20640384. Its totient is φ = 7624704.

The previous prime is 13444157. The next prime is 13444231. The reversal of 13444221 is 12244431.

It is not a de Polignac number, because 13444221 - 2⁶ = 13444157 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13444231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 541 + ... + 5213.

It is an arithmetic number, because the mean of its divisors is an integer number (1290024).

Almost surely, 2^13444221 is an apocalyptic number.

It is an amenable number.

13444221 is a deficient number, since it is larger than the sum of its proper divisors (7196163).

13444221 is a wasteful number, since it uses less digits than its factorization.

13444221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4820.

The product of its digits is 768, while the sum is 21.

The square root of 13444221 is about 3666.6361968431. The cubic root of 13444221 is about 237.7817656785.

Adding to 13444221 its reverse (12244431), we get a palindrome (25688652).

It can be divided in two parts, 134442 and 21, that multiplied together give a palindrome (2823282).

The spelling of 13444221 in words is "thirteen million, four hundred forty-four thousand, two hundred twenty-one".