6429776771021 has 2 divisors, whose sum is σ = 6429776771022. Its totient is φ = 6429776771020.

The previous prime is 6429776770987. The next prime is 6429776771027. The reversal of 6429776771021 is 1201776779246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5671118350921 + 758658420100 = 2381411^2 + 871010^2 .

It is a cyclic number.

It is not a de Polignac number, because 6429776771021 - 2³⁰ = 6428703029197 is a prime.

It is a super-2 number, since 2×6429776771021² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6429776771027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3214888385510 + 3214888385511.

It is an arithmetic number, because the mean of its divisors is an integer number (3214888385511).

Almost surely, 2^{6429776771021} is an apocalyptic number.

It is an amenable number.

6429776771021 is a deficient number, since it is larger than the sum of its proper divisors (1).

6429776771021 is an equidigital number, since it uses as much as digits as its factorization.

6429776771021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12446784, while the sum is 59.

The spelling of 6429776771021 in words is "six trillion, four hundred twenty-nine billion, seven hundred seventy-six million, seven hundred seventy-one thousand, twenty-one".