13467721 has 4 divisors (see below), whose sum is σ = 13796244. Its totient is φ = 13139200.

The previous prime is 13467691. The next prime is 13467731. The reversal of 13467721 is 12776431.

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 2676496 + 10791225 = 1636^2 + 3285^2 .

It is a cyclic number.

It is not a de Polignac number, because 13467721 - 2¹⁷ = 13336649 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13467731) 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, 164200 + ... + 164281.

It is an arithmetic number, because the mean of its divisors is an integer number (3449061).

Almost surely, 2^13467721 is an apocalyptic number.

It is an amenable number.

13467721 is a deficient number, since it is larger than the sum of its proper divisors (328523).

13467721 is an equidigital number, since it uses as much as digits as its factorization.

13467721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328522.

The product of its digits is 7056, while the sum is 31.

The square root of 13467721 is about 3669.8393697817. The cubic root of 13467721 is about 237.9202296042.

The spelling of 13467721 in words is "thirteen million, four hundred sixty-seven thousand, seven hundred twenty-one".