13110721 has 4 divisors (see below), whose sum is σ = 14119252. Its totient is φ = 12102192.

The previous prime is 13110719. The next prime is 13110739. The reversal of 13110721 is 12701131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4260096 + 8850625 = 2064^2 + 2975^2 .

It is a cyclic number.

It is not a de Polignac number, because 13110721 - 2¹ = 13110719 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13110695 and 13110704.

It is not an unprimeable number, because it can be changed into a prime (13110781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 504246 + ... + 504271.

It is an arithmetic number, because the mean of its divisors is an integer number (3529813).

Almost surely, 2^13110721 is an apocalyptic number.

It is an amenable number.

13110721 is a deficient number, since it is larger than the sum of its proper divisors (1008531).

13110721 is a wasteful number, since it uses less digits than its factorization.

13110721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1008530.

The product of its (nonzero) digits is 42, while the sum is 16.

The square root of 13110721 is about 3620.8729610413. The cubic root of 13110721 is about 235.7991264494.

Adding to 13110721 its reverse (12701131), we get a palindrome (25811852).

It can be divided in two parts, 13110 and 721, that added together give a palindrome (13831).

The spelling of 13110721 in words is "thirteen million, one hundred ten thousand, seven hundred twenty-one".