4021225 has 12 divisors (see below), whose sum is σ = 5370316. Its totient is φ = 2969280.

The previous prime is 4021211. The next prime is 4021229. The reversal of 4021225 is 5221204.

It can be written as a sum of positive squares in 6 ways, for example, as 426409 + 3594816 = 653^2 + 1896^2 .

It is not a de Polignac number, because 4021225 - 2⁷ = 4021097 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 4021199 and 4021208.

It is not an unprimeable number, because it can be changed into a prime (4021229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5862 + ... + 6511.

Almost surely, 2^4021225 is an apocalyptic number.

It is an amenable number.

4021225 is a deficient number, since it is larger than the sum of its proper divisors (1349091).

4021225 is a wasteful number, since it uses less digits than its factorization.

4021225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12396 (or 12391 counting only the distinct ones).

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

The square root of 4021225 is about 2005.2992295416. The cubic root of 4021225 is about 159.0203816020.

Adding to 4021225 its reverse (5221204), we get a palindrome (9242429).

The spelling of 4021225 in words is "four million, twenty-one thousand, two hundred twenty-five".