4254021 has 6 divisors (see below), whose sum is σ = 6144710. Its totient is φ = 2836008.

The previous prime is 4254013. The next prime is 4254049. The reversal of 4254021 is 1204524.

It can be written as a sum of positive squares in only one way, i.e., 3744225 + 509796 = 1935^2 + 714^2 .

It is not a de Polignac number, because 4254021 - 2³ = 4254013 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4253985 and 4254003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4254091) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 236326 + ... + 236343.

Almost surely, 2^4254021 is an apocalyptic number.

It is an amenable number.

4254021 is a deficient number, since it is larger than the sum of its proper divisors (1890689).

4254021 is a wasteful number, since it uses less digits than its factorization.

4254021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472675 (or 472672 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 4254021 is about 2062.5278179942. The cubic root of 4254021 is about 162.0316581934.

Adding to 4254021 its reverse (1204524), we get a palindrome (5458545).

The spelling of 4254021 in words is "four million, two hundred fifty-four thousand, twenty-one".