4203421 has 2 divisors, whose sum is σ = 4203422. Its totient is φ = 4203420.

The previous prime is 4203391. The next prime is 4203431. The reversal of 4203421 is 1243024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2937796 + 1265625 = 1714^2 + 1125^2 .

It is a cyclic number.

It is not a de Polignac number, because 4203421 - 2¹³ = 4195229 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4203395 and 4203404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4203431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2101710 + 2101711.

It is an arithmetic number, because the mean of its divisors is an integer number (2101711).

Almost surely, 2^4203421 is an apocalyptic number.

It is an amenable number.

4203421 is a deficient number, since it is larger than the sum of its proper divisors (1).

4203421 is an equidigital number, since it uses as much as digits as its factorization.

4203421 is an odious number, because the sum of its binary digits is odd.

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

The square root of 4203421 is about 2050.2246218403. The cubic root of 4203421 is about 161.3866585824.

Adding to 4203421 its reverse (1243024), we get a palindrome (5446445).

It can be divided in two parts, 4203 and 421, that added together give a square (4624 = 68²).

The spelling of 4203421 in words is "four million, two hundred three thousand, four hundred twenty-one".