4221025 has 12 divisors (see below), whose sum is σ = 5285500. Its totient is φ = 3343680.

The previous prime is 4221011. The next prime is 4221031. The reversal of 4221025 is 5201224.

It can be written as a sum of positive squares in 6 ways, for example, as 63504 + 4157521 = 252^2 + 2039^2 .

It is not a de Polignac number, because 4221025 - 2¹⁵ = 4188257 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1951 + ... + 3499.

Almost surely, 2^4221025 is an apocalyptic number.

It is an amenable number.

4221025 is a deficient number, since it is larger than the sum of its proper divisors (1064475).

4221025 is a wasteful number, since it uses less digits than its factorization.

4221025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1668 (or 1663 counting only the distinct ones).

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

The square root of 4221025 is about 2054.5133243666. The cubic root of 4221025 is about 161.6116415044.

Adding to 4221025 its reverse (5201224), we get a palindrome (9422249).

The spelling of 4221025 in words is "four million, two hundred twenty-one thousand, twenty-five".