4023221 has 2 divisors, whose sum is σ = 4023222. Its totient is φ = 4023220.

The previous prime is 4023191. The next prime is 4023223. The reversal of 4023221 is 1223204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2788900 + 1234321 = 1670^2 + 1111^2 .

It is a cyclic number.

It is not a de Polignac number, because 4023221 - 2¹⁰ = 4022197 is a prime.

Together with 4023223, 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 = 4023196 and 4023205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4023223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2011610 + 2011611.

It is an arithmetic number, because the mean of its divisors is an integer number (2011611).

Almost surely, 2^4023221 is an apocalyptic number.

It is an amenable number.

4023221 is a deficient number, since it is larger than the sum of its proper divisors (1).

4023221 is an equidigital number, since it uses as much as digits as its factorization.

4023221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 4023221 is about 2005.7968491350. The cubic root of 4023221 is about 159.0466880285.

Adding to 4023221 its reverse (1223204), we get a palindrome (5246425).

The spelling of 4023221 in words is "four million, twenty-three thousand, two hundred twenty-one".