13282721 has 4 divisors (see below), whose sum is σ = 13309632. Its totient is φ = 13255812.

The previous prime is 13282697. The next prime is 13282723. The reversal of 13282721 is 12728231.

13282721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13282721 - 2¹⁸ = 13020577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13282723) 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, 12701 + ... + 13706.

It is an arithmetic number, because the mean of its divisors is an integer number (3327408).

Almost surely, 2^13282721 is an apocalyptic number.

It is an amenable number.

13282721 is a deficient number, since it is larger than the sum of its proper divisors (26911).

13282721 is an equidigital number, since it uses as much as digits as its factorization.

13282721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26910.

The product of its digits is 1344, while the sum is 26.

The square root of 13282721 is about 3644.5467482254. The cubic root of 13282721 is about 236.8258020738.

The spelling of 13282721 in words is "thirteen million, two hundred eighty-two thousand, seven hundred twenty-one".