14221721 has 2 divisors, whose sum is σ = 14221722. Its totient is φ = 14221720.

The previous prime is 14221703. The next prime is 14221769. The reversal of 14221721 is 12712241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10758400 + 3463321 = 3280^2 + 1861^2 .

It is an emirp because it is prime and its reverse (12712241) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 14221721 - 2⁶ = 14221657 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 14221693 and 14221702.

It is not a weakly prime, because it can be changed into another prime (14221771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7110860 + 7110861.

It is an arithmetic number, because the mean of its divisors is an integer number (7110861).

Almost surely, 2^14221721 is an apocalyptic number.

It is an amenable number.

14221721 is a deficient number, since it is larger than the sum of its proper divisors (1).

14221721 is an equidigital number, since it uses as much as digits as its factorization.

14221721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 224, while the sum is 20.

The square root of 14221721 is about 3771.1697124367. The cubic root of 14221721 is about 242.2798994862.

Adding to 14221721 its reverse (12712241), we get a palindrome (26933962).

The spelling of 14221721 in words is "fourteen million, two hundred twenty-one thousand, seven hundred twenty-one".