4272221 has 2 divisors, whose sum is σ = 4272222. Its totient is φ = 4272220.

The previous prime is 4272211. The next prime is 4272223. The reversal of 4272221 is 1222724.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4120900 + 151321 = 2030^2 + 389^2 .

It is a cyclic number.

It is not a de Polignac number, because 4272221 - 2⁶ = 4272157 is a prime.

Together with 4272223, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 4272193 and 4272202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4272223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2136110 + 2136111.

It is an arithmetic number, because the mean of its divisors is an integer number (2136111).

Almost surely, 2^4272221 is an apocalyptic number.

It is an amenable number.

4272221 is a deficient number, since it is larger than the sum of its proper divisors (1).

4272221 is an equidigital number, since it uses as much as digits as its factorization.

4272221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 448, while the sum is 20.

The square root of 4272221 is about 2066.9351707298. The cubic root of 4272221 is about 162.2624030664.

Adding to 4272221 its reverse (1222724), we get a palindrome (5494945).

The spelling of 4272221 in words is "four million, two hundred seventy-two thousand, two hundred twenty-one".