77034325521421 has 2 divisors, whose sum is σ = 77034325521422. Its totient is φ = 77034325521420.

The previous prime is 77034325521389. The next prime is 77034325521451. The reversal of 77034325521421 is 12412552343077.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41323542298921 + 35710783222500 = 6428339^2 + 5975850^2 .

It is a cyclic number.

It is not a de Polignac number, because 77034325521421 - 2⁵ = 77034325521389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77034325521451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38517162760710 + 38517162760711.

It is an arithmetic number, because the mean of its divisors is an integer number (38517162760711).

Almost surely, 2^{77034325521421} is an apocalyptic number.

It is an amenable number.

77034325521421 is a deficient number, since it is larger than the sum of its proper divisors (1).

77034325521421 is an equidigital number, since it uses as much as digits as its factorization.

77034325521421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1411200, while the sum is 46.

Adding to 77034325521421 its reverse (12412552343077), we get a palindrome (89446877864498).

The spelling of 77034325521421 in words is "seventy-seven trillion, thirty-four billion, three hundred twenty-five million, five hundred twenty-one thousand, four hundred twenty-one".