4342021 has 4 divisors (see below), whose sum is σ = 4597452. Its totient is φ = 4086592.

The previous prime is 4342007. The next prime is 4342031. The reversal of 4342021 is 1202434.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2937796 + 1404225 = 1714^2 + 1185^2 .

It is a cyclic number.

It is not a de Polignac number, because 4342021 - 2⁷ = 4341893 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 = 4341986 and 4342004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4342031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127690 + ... + 127723.

It is an arithmetic number, because the mean of its divisors is an integer number (1149363).

Almost surely, 2^4342021 is an apocalyptic number.

It is an amenable number.

4342021 is a deficient number, since it is larger than the sum of its proper divisors (255431).

4342021 is a wasteful number, since it uses less digits than its factorization.

4342021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255430.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 4342021 is about 2083.7516646664. The cubic root of 4342021 is about 163.1413204753.

Adding to 4342021 its reverse (1202434), we get a palindrome (5544455).

The spelling of 4342021 in words is "four million, three hundred forty-two thousand, twenty-one".