14172721 has 2 divisors, whose sum is σ = 14172722. Its totient is φ = 14172720.

The previous prime is 14172701. The next prime is 14172733. The reversal of 14172721 is 12727141.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9678321 + 4494400 = 3111^2 + 2120^2 .

It is a cyclic number.

It is not a de Polignac number, because 14172721 - 2¹³ = 14164529 is a prime.

It is not a weakly prime, because it can be changed into another prime (14172701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7086360 + 7086361.

It is an arithmetic number, because the mean of its divisors is an integer number (7086361).

Almost surely, 2^14172721 is an apocalyptic number.

It is an amenable number.

14172721 is a deficient number, since it is larger than the sum of its proper divisors (1).

14172721 is an equidigital number, since it uses as much as digits as its factorization.

14172721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 784, while the sum is 25.

The square root of 14172721 is about 3764.6674487928. The cubic root of 14172721 is about 242.0013261772.

Adding to 14172721 its reverse (12727141), we get a palindrome (26899862).

The spelling of 14172721 in words is "fourteen million, one hundred seventy-two thousand, seven hundred twenty-one".