4064729821 has 2 divisors, whose sum is σ = 4064729822. Its totient is φ = 4064729820.

The previous prime is 4064729819. The next prime is 4064729909. The reversal of 4064729821 is 1289274604.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3972780900 + 91948921 = 63030^2 + 9589^2 .

It is a cyclic number.

It is not a de Polignac number, because 4064729821 - 2¹ = 4064729819 is a prime.

Together with 4064729819, 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 (4064723821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2032364910 + 2032364911.

It is an arithmetic number, because the mean of its divisors is an integer number (2032364911).

Almost surely, 2^4064729821 is an apocalyptic number.

It is an amenable number.

4064729821 is a deficient number, since it is larger than the sum of its proper divisors (1).

4064729821 is an equidigital number, since it uses as much as digits as its factorization.

4064729821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 43.

The square root of 4064729821 is about 63755.2336753619. The cubic root of 4064729821 is about 1595.9179565418.

The spelling of 4064729821 in words is "four billion, sixty-four million, seven hundred twenty-nine thousand, eight hundred twenty-one".