84538401421 has 2 divisors, whose sum is σ = 84538401422. Its totient is φ = 84538401420.

The previous prime is 84538401407. The next prime is 84538401443. The reversal of 84538401421 is 12410483548.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57506438025 + 27031963396 = 239805^2 + 164414^2 .

It is a cyclic number.

It is not a de Polignac number, because 84538401421 - 2⁹ = 84538400909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84538401461) 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, 42269200710 + 42269200711.

It is an arithmetic number, because the mean of its divisors is an integer number (42269200711).

Almost surely, 2^84538401421 is an apocalyptic number.

It is an amenable number.

84538401421 is a deficient number, since it is larger than the sum of its proper divisors (1).

84538401421 is an equidigital number, since it uses as much as digits as its factorization.

84538401421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 122880, while the sum is 40.

Adding to 84538401421 its reverse (12410483548), we get a palindrome (96948884969).

The spelling of 84538401421 in words is "eighty-four billion, five hundred thirty-eight million, four hundred one thousand, four hundred twenty-one".