14181721 has 2 divisors, whose sum is σ = 14181722. Its totient is φ = 14181720.

The previous prime is 14181719. The next prime is 14181737. The reversal of 14181721 is 12718141.

14181721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9834496 + 4347225 = 3136^2 + 2085^2 .

It is a cyclic number.

It is not a de Polignac number, because 14181721 - 2¹ = 14181719 is a prime.

It is a super-2 number, since 2×14181721² = 402242421043682, which contains 22 as substring.

Together with 14181719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (14181781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7090860 + 7090861.

It is an arithmetic number, because the mean of its divisors is an integer number (7090861).

Almost surely, 2^14181721 is an apocalyptic number.

It is an amenable number.

14181721 is a deficient number, since it is larger than the sum of its proper divisors (1).

14181721 is an equidigital number, since it uses as much as digits as its factorization.

14181721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 448, while the sum is 25.

The square root of 14181721 is about 3765.8625837914. The cubic root of 14181721 is about 242.0525407856.

Adding to 14181721 its reverse (12718141), we get a palindrome (26899862).

The spelling of 14181721 in words is "fourteen million, one hundred eighty-one thousand, seven hundred twenty-one".