4335920778221 has 2 divisors, whose sum is σ = 4335920778222. Its totient is φ = 4335920778220.

The previous prime is 4335920778209. The next prime is 4335920778323. The reversal of 4335920778221 is 1228770295334.

4335920778221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3776760805321 + 559159972900 = 1943389^2 + 747770^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4335920778221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4335920778521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2167960389110 + 2167960389111.

It is an arithmetic number, because the mean of its divisors is an integer number (2167960389111).

Almost surely, 2^{4335920778221} is an apocalyptic number.

It is an amenable number.

4335920778221 is a deficient number, since it is larger than the sum of its proper divisors (1).

4335920778221 is an equidigital number, since it uses as much as digits as its factorization.

4335920778221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5080320, while the sum is 53.

The spelling of 4335920778221 in words is "four trillion, three hundred thirty-five billion, nine hundred twenty million, seven hundred seventy-eight thousand, two hundred twenty-one".