4025021 has 16 divisors (see below), whose sum is σ = 5405568. Its totient is φ = 2894400.

The previous prime is 4025003. The next prime is 4025027. The reversal of 4025021 is 1205204.

It is a cyclic number.

It is not a de Polignac number, because 4025021 - 2⁶ = 4024957 is a prime.

It is an Ulam number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 4024987 and 4025005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4025027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1010 + ... + 3011.

It is an arithmetic number, because the mean of its divisors is an integer number (337848).

Almost surely, 2^4025021 is an apocalyptic number.

It is an amenable number.

4025021 is a deficient number, since it is larger than the sum of its proper divisors (1380547).

4025021 is a wasteful number, since it uses less digits than its factorization.

4025021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4052.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 4025021 is about 2006.2454984373. The cubic root of 4025021 is about 159.0704037987.

The spelling of 4025021 in words is "four million, twenty-five thousand, twenty-one".