13160721 has 8 divisors (see below), whose sum is σ = 20054464. Its totient is φ = 7520400.

The previous prime is 13160701. The next prime is 13160731. The reversal of 13160721 is 12706131.

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

It is not a de Polignac number, because 13160721 - 2⁶ = 13160657 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 626701 = 13160721 / (1 + 3 + 1 + 6 + 0 + 7 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13160701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 313330 + ... + 313371.

It is an arithmetic number, because the mean of its divisors is an integer number (2506808).

Almost surely, 2^13160721 is an apocalyptic number.

It is an amenable number.

13160721 is a deficient number, since it is larger than the sum of its proper divisors (6893743).

13160721 is an equidigital number, since it uses as much as digits as its factorization.

13160721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626711.

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 13160721 is about 3627.7708031241. The cubic root of 13160721 is about 236.0984997719.

Adding to 13160721 its reverse (12706131), we get a palindrome (25866852).

The spelling of 13160721 in words is "thirteen million, one hundred sixty thousand, seven hundred twenty-one".