4221751 has 2 divisors, whose sum is σ = 4221752. Its totient is φ = 4221750.

The previous prime is 4221713. The next prime is 4221761. The reversal of 4221751 is 1571224.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 4221751 - 2¹⁷ = 4090679 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4221761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2110875 + 2110876.

It is an arithmetic number, because the mean of its divisors is an integer number (2110876).

Almost surely, 2^4221751 is an apocalyptic number.

4221751 is the 1300-th centered pentagonal number.

4221751 is a deficient number, since it is larger than the sum of its proper divisors (1).

4221751 is an equidigital number, since it uses as much as digits as its factorization.

4221751 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 560, while the sum is 22.

The square root of 4221751 is about 2054.6900009490. The cubic root of 4221751 is about 161.6209064993.

Adding to 4221751 its reverse (1571224), we get a palindrome (5792975).

The spelling of 4221751 in words is "four million, two hundred twenty-one thousand, seven hundred fifty-one".