4242421 has 2 divisors, whose sum is σ = 4242422. Its totient is φ = 4242420.

The previous prime is 4242409. The next prime is 4242437. The reversal of 4242421 is 1242424.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3845521 + 396900 = 1961^2 + 630^2 .

It is a cyclic number.

It is not a de Polignac number, because 4242421 - 2¹³ = 4234229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4242451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2121210 + 2121211.

It is an arithmetic number, because the mean of its divisors is an integer number (2121211).

Almost surely, 2^4242421 is an apocalyptic number.

It is an amenable number.

4242421 is a deficient number, since it is larger than the sum of its proper divisors (1).

4242421 is an equidigital number, since it uses as much as digits as its factorization.

4242421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 512, while the sum is 19.

The square root of 4242421 is about 2059.7138150724. The cubic root of 4242421 is about 161.8842464270.

Adding to 4242421 its reverse (1242424), we get a palindrome (5484845).

The spelling of 4242421 in words is "four million, two hundred forty-two thousand, four hundred twenty-one".