13721105 has 8 divisors (see below), whose sum is σ = 16697664. Its totient is φ = 10822000.

The previous prime is 13721093. The next prime is 13721111. The reversal of 13721105 is 50112731.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13721105 - 2¹⁴ = 13704721 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18971 + ... + 19680.

It is an arithmetic number, because the mean of its divisors is an integer number (2087208).

Almost surely, 2^13721105 is an apocalyptic number.

It is an amenable number.

13721105 is a deficient number, since it is larger than the sum of its proper divisors (2976559).

13721105 is an equidigital number, since it uses as much as digits as its factorization.

13721105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38727.

The product of its (nonzero) digits is 210, while the sum is 20.

The square root of 13721105 is about 3704.2009934667. The cubic root of 13721105 is about 239.4030593126.

Adding to 13721105 its reverse (50112731), we get a palindrome (63833836).

The spelling of 13721105 in words is "thirteen million, seven hundred twenty-one thousand, one hundred five".