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7422221 is a prime number
BaseRepresentation
bin11100010100000100001101
3111222002101002
4130110010031
53400002341
6423030045
7120042062
oct34240415
914862332
107422221
11420a474
12259b325
1316cb461
14db2c69
159b929b
hex71410d

7422221 has 2 divisors, whose sum is σ = 7422222. Its totient is φ = 7422220.

The previous prime is 7422211. The next prime is 7422223. The reversal of 7422221 is 1222247.

It is a happy number.

7422221 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5692996 + 1729225 = 2386^2 + 1315^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-7422221 is a prime.

Together with 7422223, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 7422193 and 7422202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7422223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3711110 + 3711111.

It is an arithmetic number, because the mean of its divisors is an integer number (3711111).

Almost surely, 27422221 is an apocalyptic number.

It is an amenable number.

7422221 is a deficient number, since it is larger than the sum of its proper divisors (1).

7422221 is an equidigital number, since it uses as much as digits as its factorization.

7422221 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 7422221 is about 2724.3753412480. The cubic root of 7422221 is about 195.0643749762.

Adding to 7422221 its reverse (1222247), we get a palindrome (8644468).

The spelling of 7422221 in words is "seven million, four hundred twenty-two thousand, two hundred twenty-one".