4026221 has 2 divisors, whose sum is σ = 4026222. Its totient is φ = 4026220.

The previous prime is 4026199. The next prime is 4026223. The reversal of 4026221 is 1226204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3556996 + 469225 = 1886^2 + 685^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4026221 is a prime.

Together with 4026223, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4026221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4026223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2013110 + 2013111.

It is an arithmetic number, because the mean of its divisors is an integer number (2013111).

Almost surely, 2^4026221 is an apocalyptic number.

It is an amenable number.

4026221 is a deficient number, since it is larger than the sum of its proper divisors (1).

4026221 is an equidigital number, since it uses as much as digits as its factorization.

4026221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 4026221 is about 2006.5445422417. The cubic root of 4026221 is about 159.0862103844.

Subtracting from 4026221 its sum of digits (17), we obtain a palindrome (4026204).

The spelling of 4026221 in words is "four million, twenty-six thousand, two hundred twenty-one".