4221421601 has 2 divisors, whose sum is σ = 4221421602. Its totient is φ = 4221421600.

The previous prime is 4221421597. The next prime is 4221421639. The reversal of 4221421601 is 1061241224.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4192692001 + 28729600 = 64751^2 + 5360^2 .

It is a cyclic number.

It is not a de Polignac number, because 4221421601 - 2² = 4221421597 is a prime.

It is not a weakly prime, because it can be changed into another prime (4221421201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2110710800 + 2110710801.

It is an arithmetic number, because the mean of its divisors is an integer number (2110710801).

Almost surely, 2^4221421601 is an apocalyptic number.

It is an amenable number.

4221421601 is a deficient number, since it is larger than the sum of its proper divisors (1).

4221421601 is an equidigital number, since it uses as much as digits as its factorization.

4221421601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 4221421601 is about 64972.4680230019. The cubic root of 4221421601 is about 1616.1670293943.

Adding to 4221421601 its reverse (1061241224), we get a palindrome (5282662825).

The spelling of 4221421601 in words is "four billion, two hundred twenty-one million, four hundred twenty-one thousand, six hundred one".