13144221 has 16 divisors (see below), whose sum is σ = 20145600. Its totient is φ = 8460144.

The previous prime is 13144211. The next prime is 13144249. The reversal of 13144221 is 12244131.

It is not a de Polignac number, because 13144221 - 2⁹ = 13143709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13144194 and 13144203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13144211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7611 + ... + 9176.

It is an arithmetic number, because the mean of its divisors is an integer number (1259100).

Almost surely, 2^13144221 is an apocalyptic number.

It is an amenable number.

13144221 is a deficient number, since it is larger than the sum of its proper divisors (7001379).

13144221 is a wasteful number, since it uses less digits than its factorization.

13144221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16825 (or 16819 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 13144221 is about 3625.4959660714. The cubic root of 13144221 is about 235.9997905294. Note that the first 3 decimals are identical.

Adding to 13144221 its reverse (12244131), we get a palindrome (25388352).

The spelling of 13144221 in words is "thirteen million, one hundred forty-four thousand, two hundred twenty-one".