4221003421 has 2 divisors, whose sum is σ = 4221003422. Its totient is φ = 4221003420.

The previous prime is 4221003419. The next prime is 4221003427. The reversal of 4221003421 is 1243001224.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2577592900 + 1643410521 = 50770^2 + 40539^2 .

It is a cyclic number.

It is not a de Polignac number, because 4221003421 - 2¹ = 4221003419 is a prime.

Together with 4221003419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4221003427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2110501710 + 2110501711.

It is an arithmetic number, because the mean of its divisors is an integer number (2110501711).

Almost surely, 2^4221003421 is an apocalyptic number.

It is an amenable number.

4221003421 is a deficient number, since it is larger than the sum of its proper divisors (1).

4221003421 is an equidigital number, since it uses as much as digits as its factorization.

4221003421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 4221003421 is about 64969.2498109683. The cubic root of 4221003421 is about 1616.1136610341.

Adding to 4221003421 its reverse (1243001224), we get a palindrome (5464004645).

The spelling of 4221003421 in words is "four billion, two hundred twenty-one million, three thousand, four hundred twenty-one".