14521721 has 8 divisors (see below), whose sum is σ = 15270600. Its totient is φ = 13789440.

The previous prime is 14521711. The next prime is 14521751. The reversal of 14521721 is 12712541.

It can be written as a sum of positive squares in 4 ways, for example, as 354025 + 14167696 = 595^2 + 3764^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 14521721 - 2⁶ = 14521657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (14521711) 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, 2336 + ... + 5873.

It is an arithmetic number, because the mean of its divisors is an integer number (1908825).

Almost surely, 2^14521721 is an apocalyptic number.

It is an amenable number.

14521721 is a deficient number, since it is larger than the sum of its proper divisors (748879).

14521721 is an equidigital number, since it uses as much as digits as its factorization.

14521721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8299.

The product of its digits is 560, while the sum is 23.

The square root of 14521721 is about 3810.7375926453. The cubic root of 14521721 is about 243.9716497116.

The spelling of 14521721 in words is "fourteen million, five hundred twenty-one thousand, seven hundred twenty-one".