4221003221 has 2 divisors, whose sum is σ = 4221003222. Its totient is φ = 4221003220.

The previous prime is 4221003191. The next prime is 4221003233. The reversal of 4221003221 is 1223001224.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3221811121 + 999192100 = 56761^2 + 31610^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4221003221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4221003221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4221003421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2110501610 + 2110501611.

It is an arithmetic number, because the mean of its divisors is an integer number (2110501611).

Almost surely, 2^4221003221 is an apocalyptic number.

It is an amenable number.

4221003221 is a deficient number, since it is larger than the sum of its proper divisors (1).

4221003221 is an equidigital number, since it uses as much as digits as its factorization.

4221003221 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 17.

The square root of 4221003221 is about 64969.2482717785. The cubic root of 4221003221 is about 1616.1136355091.

Adding to 4221003221 its reverse (1223001224), we get a palindrome (5444004445).

It can be divided in two parts, 4221003 and 221, that added together give a palindrome (4221224).

The spelling of 4221003221 in words is "four billion, two hundred twenty-one million, three thousand, two hundred twenty-one".