4021281 has 24 divisors (see below), whose sum is σ = 6402240. Its totient is φ = 2412000.

The previous prime is 4021261. The next prime is 4021301. The reversal of 4021281 is 1821204.

4021281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (4021261) and next prime (4021301).

It is not a de Polignac number, because 4021281 - 2⁵ = 4021249 is a prime.

It is a super-2 number, since 2×4021281² = 32341401761922, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4021211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14815 + ... + 15083.

It is an arithmetic number, because the mean of its divisors is an integer number (266760).

Almost surely, 2^4021281 is an apocalyptic number.

It is an amenable number.

4021281 is a deficient number, since it is larger than the sum of its proper divisors (2380959).

4021281 is a wasteful number, since it uses less digits than its factorization.

4021281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437 (or 434 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 4021281 is about 2005.3131924964. The cubic root of 4021281 is about 159.0211197767.

Adding to 4021281 its reverse (1821204), we get a palindrome (5842485).

It can be divided in two parts, 40 and 21281, that added together give a triangular number (21321 = T₂₀₆).

The spelling of 4021281 in words is "four million, twenty-one thousand, two hundred eighty-one".