4025221 has 4 divisors (see below), whose sum is σ = 4110912. Its totient is φ = 3939532.

The previous prime is 4025179. The next prime is 4025227. The reversal of 4025221 is 1225204.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4025221 - 2¹⁵ = 3992453 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4025195 and 4025204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4025227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42775 + ... + 42868.

It is an arithmetic number, because the mean of its divisors is an integer number (1027728).

Almost surely, 2^4025221 is an apocalyptic number.

It is an amenable number.

4025221 is a deficient number, since it is larger than the sum of its proper divisors (85691).

4025221 is an equidigital number, since it uses as much as digits as its factorization.

4025221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85690.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 4025221 is about 2006.2953421668. The cubic root of 4025221 is about 159.0730384478.

The spelling of 4025221 in words is "four million, twenty-five thousand, two hundred twenty-one".